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tjet
Samba Member
Joined: June 10, 2014
Posts: 3725
Location: Az
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 Posted: Sun Sep 04, 2016 12:56 pm Post subject: Re: Wiring up a "dual" VDO Oil Pressure Sender |
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| Copy that. I see the wiring now. It kind of disappears behind the gas tank (syncro). I was trying to route it into the cabin where the ECU is. |
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32988
Location: Reading Pennsylvania
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tjet
Samba Member
Joined: June 10, 2014
Posts: 3725
Location: Az
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| Posted: Sun Sep 04, 2016 12:33 pm Post subject: Re: Wiring up a "dual" VDO Oil Pressure Sender |
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Hi Dave. So you started feeding the wire thru in the front of the van? I was starting from the engine compt. I guess I can go the other way.
As for the "WK" lug on the new sender, I ran a wire to it & tapped into the low oil pressure green wire. Now I have a dual redundant low oil pressure light warning system  . It works too. I had a test light on the WK term & the test light went out a split second after the dash light did when I started it up. Note, the high pressure port on this new engine I installed is capped off & not utilized. I grounded that "high" yellow wire. |
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32988
Location: Reading Pennsylvania
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tjet
Samba Member
Joined: June 10, 2014
Posts: 3725
Location: Az
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| Posted: Sun Sep 04, 2016 10:05 am Post subject: |
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| funagon wrote: |
G to gauge, WK to idiot light.
I also used the same VDO kit with no problems. I mounted the clamp to the engine tin a little differently, so that it's easier to remove and install the tin:
Other than that I followed the instructions on the van-cafe web site:
http://volkscafe.com/vanagonparts.jsp?pa=ip&ip=1401786957 |
I'm installing this VC gauge kit now. So, as I understand it, the "WK" terminal on the sender "opens" once a predetermined oil pressure is met - like the low oil pressure switch on an '87?
Also, how did you guys route the sensor wire - what hole thru the firewall?
Thanks |
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bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
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| Posted: Thu Oct 24, 2013 3:41 pm Post subject: Re: VDO oil pressure Sender and gauge. |
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| barry cox wrote: |
| Hey guys, I took my 2 pole VDO Sender and gauge to my mechanic friend, and he said the sender is bad, and not the gauge.. My question is, can I buy an older VDO Sender, like those on the Samba site here, that will work with my VDO 80 psi. gauge? Some of these are from the 80"s and 70"s. |
The sendor should match the gage, an 80 psi sendor with an 80 psi gage, a 70 with 70 150 with 150 and so forth. there should be pressure indication printed on the sendor, maybe in psi, kPa or atm. |
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barry cox
Samba Member
Joined: April 13, 2011
Posts: 74
Location: SEMMES, ALABAMA
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| Posted: Thu Oct 24, 2013 2:54 pm Post subject: Oil Sender and Gauge |
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| I appreciate all the help from all of you. It is a blessing to have people who really care to help each other, those whose path will never meet in this world. VW GUYS and GALS are the best. |
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barry cox
Samba Member
Joined: April 13, 2011
Posts: 74
Location: SEMMES, ALABAMA
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| Posted: Thu Oct 24, 2013 2:41 pm Post subject: oil sender. |
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| When I had it in a while back, one guy told me I needed a solid run of wire to the sender without connectors or joints, so I ran 2 new wires, all one piece. It did not change or effect the gauge reading at all. So I am just waiting to hear back from the seller on it. |
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bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
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| Posted: Thu Oct 24, 2013 8:53 am Post subject: Re: electric oil pressure gauge |
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| barry cox wrote: |
| Hey VW guys, I need help. I have a 73 Beetle, and I put a 2 pole VDO Sender on the block, and wired it to VDO gauge. I have the G wire going to the S terminal on the gauge and the WK wire going to my idiot light on the speedo head. The + terminal is on a 12v switched terminal on the fuse block. When I turn the ignition on, the gauge pegs all the way over and does not come back when the egine cranks up. I do not care about the idiot light, I just need my gauge to read oil pressure. Can somebody help me? Thanks, Barry |
I think you may have a short in the wire from the sendor to the gage to ground. As I recall if the gage to sendor wire is shorted to ground it pegs the gage to maximum, if the wire from gage to sendor is open (falls off ) then the gage reads zero, so check the wire to make sure the insulation has to rubbed off and it is shorting to ground someplace.
also the gage itself must be grounded, on the negative terminal. also for accurate reading the sendor body must be grounded, usually thru the threads, however excessive sealing Teflon tape can make that connection a poor ground . if you got an ohm meter you can test the wires, just don't run the ohm meter to the gage, the battery in the ohm meter might be enough to harm the gage, but it cant harm the sendor |
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barry cox
Samba Member
Joined: April 13, 2011
Posts: 74
Location: SEMMES, ALABAMA
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| Posted: Thu Oct 24, 2013 7:46 am Post subject: Electric Oil Pressure Gauge |
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| Thanks for the help, all the advice guys. I mailed the sender back to the seller, and just waiting to see what he says about it after he checks it. |
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T3 Pilot
Samba Member
Joined: January 10, 2011
Posts: 1509
Location: Deep South of the Great White North
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barry cox
Samba Member
Joined: April 13, 2011
Posts: 74
Location: SEMMES, ALABAMA
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| Posted: Mon Oct 21, 2013 12:50 pm Post subject: VDO oil pressure Sender and gauge. |
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| Hey guys, I took my 2 pole VDO Sender and gauge to my mechanic friend, and he said the sender is bad, and not the gauge.. My question is, can I buy an older VDO Sender, like those on the Samba site here, that will work with my VDO 80 psi. gauge? Some of these are from the 80"s and 70"s. |
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Zeitgeist 13
Samba Member
Joined: March 05, 2009
Posts: 12167
Location: Port Manteau
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| Posted: Mon Jul 08, 2013 2:25 pm Post subject: |
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Yep, I teed it in the engine compartment and even used the stock length of wire to the idiot light.
_________________
Casey--
'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik? |
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tencentlife
Samba Member
Joined: May 02, 2006
Posts: 10147
Location: Abiquiu, NM, USA
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| Posted: Mon Jul 08, 2013 1:52 pm Post subject: |
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S to G.
WK will ground your idiot light circuit, but at ~7psi, which may cause nuisance warnings. The stock idiot light switch grounds at ~4psi. Wbx's often have pretty low idle OP, which is not anything to worry about by itself (it can idle at almost zero OP without harm as there's no load on the engine), but having the idiot light on at idle all the time is a drag, so most of us install a tee and put the stock idiot light switch alongside the gauge sender, and leave the WK terminal unused.
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barry cox
Samba Member
Joined: April 13, 2011
Posts: 74
Location: SEMMES, ALABAMA
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| Posted: Mon Jul 08, 2013 1:44 pm Post subject: electric oil pressure gauge. |
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| Hey guys, my vdo gauge has 3 terminals at the bottom. One is +, one is ground, and the other is S terminal. My sender has WK and G. So what goes where again? |
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Zeitgeist 13
Samba Member
Joined: March 05, 2009
Posts: 12167
Location: Port Manteau
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| Posted: Mon Jul 08, 2013 12:09 pm Post subject: |
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The only reason I know this, is that I wired up my gauge and drove around without a sender unit for several months. I will say that observing a pegged gauge is a lot more reassuring than watching my hot idle pressure drop like a lead ball. Sometimes ignorance is bliss
_________________
Casey--
'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik? |
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tencentlife
Samba Member
Joined: May 02, 2006
Posts: 10147
Location: Abiquiu, NM, USA
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| Posted: Mon Jul 08, 2013 11:19 am Post subject: |
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| Zeitgeist 13 wrote: |
| The gauge pegs like that when it doesn't have continuity with the sending unit while receiving 12v, so you need to determine whether you've got a solid run of wire between the two appliances. |
That's correct, this is true of VDO gauges (I can't say for other brands), it is the opposite of the behavior of the stock gauges. Stock gauges peg high when sender wire is grounded, but VDO gauges go to bottom of scale when sender circuit goes to ground. Open sender circuit, stock gauges needle drops to bottom, VDO's peg high.
Knowing this makes it easy to test the integrity, or lack thereof, of your sender circuit.
_________________
Shop for unique and useful Vanagon accessories at the Vanistan shop:
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Please don't PM here, I will not reply.
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surfbeetle
Samba Member
Joined: September 07, 2005
Posts: 401
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| Posted: Mon Jul 08, 2013 11:09 am Post subject: |
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The gauge functions as a result of the amount of ground - current being sent from the sending unit. You should have power (with a fuse) from the keyed on positive + straight to the gauge and then your sending unit wires going to the other two connections on the back of the gauge. You could have the two wires at the sending unit reversed. If you have the + in the correct spot and are still pegging the gauge, either the sender is bad or there's a problem with the gauge. Also make sure the the bulb and it's wires are on the gauge are disconnected when testing so you don't have any interference with them. If after you have gotten the gauge working and you connect the bulb, maybe that was your issue.
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barry cox
Samba Member
Joined: April 13, 2011
Posts: 74
Location: SEMMES, ALABAMA
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| Posted: Sun Jul 07, 2013 1:29 pm Post subject: electric oil pressure gauge |
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| Hey Casey, I did rerun 1 wire so they both are solid runs, but it did not help. Thanks for the input. |
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Zeitgeist 13
Samba Member
Joined: March 05, 2009
Posts: 12167
Location: Port Manteau
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| Posted: Sat Jul 06, 2013 2:18 pm Post subject: |
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The gauge pegs like that when it doesn't have continuity with the sending unit while receiving 12v, so you need to determine whether you've got a solid run of wire between the two appliances.
_________________
Casey--
'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik? |
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