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Googledave
Samba Member
Joined: September 27, 2019
Posts: 121
Location: Rhinebeck, NY
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 Posted: Sun Jan 08, 2023 9:38 am Post subject: Tachometer into diesel Syncro |
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| Hi all! So when I bought my Syncro, the PO had given me a tachometer to install into the Syncro. Since I’m new to the diesel Syncro world. How do I hook one of these up? The tach is out of a vanagon. I don’t know I if it’s out of a 2nd gas or a diesel(if diesels ever had them). When we traveled last year in the van, I quickly realized how important having a tach is (for me) over having a slow working clock. Thanks all! |
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?Waldo?
Samba Member
Joined: February 22, 2006
Posts: 9752
Location: Where?
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| Posted: Sun Jan 08, 2023 9:53 am Post subject: Re: Tachometer into diesel Syncro |
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Go to the Vanagon forum home screen and type "diesel tach*" into the search field and check the little box for searching "Title only". Reading the threads that are shown as a result will answer all of your questions.
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dobryan
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Joined: March 24, 2006
Posts: 16506
Location: Brookeville, MD
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chrismsnt
Samba Member
Joined: March 06, 2018
Posts: 247
Location: Cumming, GA
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| Posted: Sun Jan 08, 2023 10:39 am Post subject: Re: Tachometer into diesel Syncro |
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Long story short is that there's a tach wire that connects to the alternator. I ran around for MONTHS reading different posts and forums. Hit me up directly if you need more info.
_________________
Chris
1989 T3 Vanagon 16" Syncro
1967 Squareback
https://vwvandiesel.com
Instagram @VW_VanDiesel |
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?Waldo?
Samba Member
Joined: February 22, 2006
Posts: 9752
Location: Where?
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| Posted: Sun Jan 08, 2023 12:00 pm Post subject: Re: Tachometer into diesel Syncro |
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| chrismsnt wrote: |
| I ran around for MONTHS reading different posts and forums. |
That must be embarrassing! |
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ALIKA T3
Samba Member
Joined: July 30, 2009
Posts: 6360
Location: Honolulu,Hawaii and France
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| Posted: Sun Jan 08, 2023 12:13 pm Post subject: Re: Tachometer into diesel Syncro |
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| ?Waldo? wrote: |
| chrismsnt wrote: |
| I ran around for MONTHS reading different posts and forums. |
That must be embarrassing! |
Remember when they were no forums? Nothing was getting done, or you had to search harder
Joke aside, post a pic of your tach, the red zone will tell you if it's a gasser or a diesel model assuming nobody swapped the faceplate, unlikely.
If it's a gasser, the circuit board needs to be modified, bc it runs off the negative side of the coil, the diesel one runs off the W output of the alternator.
If you don't have an alternator with the W output, you can add one taping in any of the phases of the alternator.
You can also calibrate the tach with the little potentiometer screw in the back should you have a non original pulley set up.
For details, I'll let you do your homework a bit, it's a good skill to have 
_________________
Silicone Steering Boots and 930 Cv boots for sale in the classifieds.
Syncro transmission upgrade parts in the Classifieds.
Subaru EJ22+UN1 5 speed transmission
http://www.thesamba.com/vw/forum/viewtopic.php?t=416343
Syncro http://www.thesamba.com/vw/forum/viewtopic.php?t=4...num+gadget |
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MarkWard
Samba Member
Joined: February 09, 2005
Posts: 17155
Location: Retired South Florida
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| Posted: Sun Jan 08, 2023 12:45 pm Post subject: Re: Tachometer into diesel Syncro |
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You might also have a TDI installed and may be able to get the rpm signal directly from the ECU. That’s what I’m doing.
I’ve seen the threads regarding modifying the gasser tach and even with the detailed how too’s soldering boards and changing resistors, transistors etc is not in my comfort zone. Basically because I don’t know what I am doing.
The downside is my tach is only accurate at around 3000 rpm. That’s where it is adjusted to.
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chrismsnt
Samba Member
Joined: March 06, 2018
Posts: 247
Location: Cumming, GA
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| Posted: Sun Jan 08, 2023 7:00 pm Post subject: Re: Tachometer into diesel Syncro |
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| ?Waldo? wrote: |
| chrismsnt wrote: |
| I ran around for MONTHS reading different posts and forums. |
That must be embarrassing! |
Not embarrassed at all... I'll be the first to admit I'm a garage / driveway tinkerer. When I was running around trying to figure out my tach not working, most were saying get the RPM's off the W post on the alternator. Well, most modern alternators that I've touched do not have a W post! So, then there were snarky posts, such as yours, saying it's just so easy. Well, for me, it took some running around, trial and error, then finally figuring it out for myself.
_________________
Chris
1989 T3 Vanagon 16" Syncro
1967 Squareback
https://vwvandiesel.com
Instagram @VW_VanDiesel |
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hans j
Samba Member
Joined: May 06, 2006
Posts: 2715
Location: Salt Lake City UT
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| Posted: Sun Jan 08, 2023 11:23 pm Post subject: Re: Tachometer into diesel Syncro |
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Since it looks like you have a JX, (mechanical IDI), you'll need to look into the alternator tach output and make sure the pulley size is correct on it.
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1986 Canadian Syncro Westy TDI - 1989 Syncro Single Cab - 2001 Audi S4 - 1981 VW Caddy ABA - 1980 VW Caddy EV - 1973 VW T-181 |
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turdburgler
Samba Member
Joined: August 30, 2007
Posts: 80
Location: Genosha
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| Posted: Tue May 30, 2023 4:11 pm Post subject: Re: Tachometer into diesel Syncro |
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Sorry to drag this up.
Pulled this from a van in the junkyard. Is this the diesel cluster/tach that is needed to run off the alternator? |
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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9939
Location: Orbiting San Diego
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| Posted: Tue May 30, 2023 4:35 pm Post subject: Re: Tachometer into diesel Syncro |
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That photo appears to be a 1984 model year instrument cluster.
That would make it for a 1.9 gas waterboxer Vanagon.
1984 Wolfsburg Edition models were the first Vanagons to come with tachs as standard.
Mark
| turdburgler wrote: |
Sorry to drag this up.
Pulled this from a van in the junkyard. Is this the diesel cluster/tach that is needed to run off the alternator? |
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ALIKA T3
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Joined: July 30, 2009
Posts: 6360
Location: Honolulu,Hawaii and France
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