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AceHH
Samba Member
Joined: April 24, 2014
Posts: 107
Location: Between Hamburg and Haiti
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 Posted: Thu May 17, 2018 4:44 am Post subject: Electric Issue with Autometer Oil Pressure |
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I have an Oval with an Autometer Oil Pressure metric 0-7 bar.
My Question, can I use a Sensor 0-10bar?
Because I want also the Warninglight in my Speedo.
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Cusser
Samba Member
Joined: October 02, 2006
Posts: 31360
Location: Hot Arizona
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| Posted: Thu May 17, 2018 7:52 am Post subject: Re: Electric Issue with Autometer Oil Pressure |
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I would think it would be OK. Your readings might be slightly off from what they'd be with a matched sender, but you're only looking for guidelines/changes.
I have a VDO oil pressure sender/gauge in mine, typically for me its value would be to alert me if oil pressure suddenly was significantly lower or higher than "normal".
With engine warmed up, I get about 10 psi for each 1000 rpm.
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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AceHH
Samba Member
Joined: April 24, 2014
Posts: 107
Location: Between Hamburg and Haiti
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| Posted: Thu May 17, 2018 8:12 am Post subject: Re: Electric Issue with Autometer Oil Pressure |
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| Cusser wrote: |
I would think it would be OK. Your readings might be slightly off from what they'd be with a matched sender, but you're only looking for guidelines/changes.
I have a VDO oil pressure sender/gauge in mine, typically for me its value would be to alert me if oil pressure suddenly was significantly lower or higher than "normal".
With engine warmed up, I get about 10 psi for each 1000 rpm. |
People told me I must have a 7 Bar Sensor with a 7 Bar Instrument or a 10bar Sensor with an 10bar Instrument. |
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Cusser
Samba Member
Joined: October 02, 2006
Posts: 31360
Location: Hot Arizona
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| Posted: Thu May 17, 2018 11:31 am Post subject: Re: Electric Issue with Autometer Oil Pressure |
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| AceHH wrote: |
| People told me I must have a 7 Bar Sensor with a 7 Bar Instrument or a 10bar Sensor with an 10bar Instrument. |
Here's how a sender works: as pressure increases, the contact against a resistance wire moves, changing the resistance (somewhat like a resistance changing in a fuel tank sender).
The gauge uses that resistance to determine how much the needle deflects.
For oil temperature, I use a VDO drain plug sender with an Autometer gauge, that's NOT a perfect match but it works.
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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Q-Dog
Samba Member
Joined: April 05, 2010
Posts: 8699
Location: Sunset, Louisiana
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| Posted: Thu May 17, 2018 11:45 am Post subject: Re: Electric Issue with Autometer Oil Pressure |
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| AceHH wrote: |
| Cusser wrote: |
I would think it would be OK. Your readings might be slightly off from what they'd be with a matched sender, but you're only looking for guidelines/changes.
I have a VDO oil pressure sender/gauge in mine, typically for me its value would be to alert me if oil pressure suddenly was significantly lower or higher than "normal".
With engine warmed up, I get about 10 psi for each 1000 rpm. |
People told me I must have a 7 Bar Sensor with a 7 Bar Instrument or a 10bar Sensor with an 10bar Instrument. |
Do you want the gauge to be accurate? I supoose they would not make 2 different senders, if they are interchangeable?
_________________
Brian
'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle |
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AceHH
Samba Member
Joined: April 24, 2014
Posts: 107
Location: Between Hamburg and Haiti
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| Posted: Thu May 17, 2018 11:51 am Post subject: Re: Electric Issue with Autometer Oil Pressure |
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| Q-Dog wrote: |
| AceHH wrote: |
| Cusser wrote: |
I would think it would be OK. Your readings might be slightly off from what they'd be with a matched sender, but you're only looking for guidelines/changes.
I have a VDO oil pressure sender/gauge in mine, typically for me its value would be to alert me if oil pressure suddenly was significantly lower or higher than "normal".
With engine warmed up, I get about 10 psi for each 1000 rpm. |
People told me I must have a 7 Bar Sensor with a 7 Bar Instrument or a 10bar Sensor with an 10bar Instrument. |
Do you want the gauge to be accurate? I supoose they would not make 2 different senders, if they are interchangeable? |
Nearly accurate would be enough.
Is it really true, that a 10bar Sensor will not work with that gauge? |
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windfish
Samba Member
Joined: September 05, 2012
Posts: 1126
Location: NC
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| Posted: Thu May 17, 2018 12:12 pm Post subject: Re: Electric Issue with Autometer Oil Pressure |
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| AceHH wrote: |
| I want also the Warninglight in my Speedo. |
You can use a T and have both the stock switch and the gauge sender
iirc the stock switch turns on the gauge light at ~3psi, and most of the dual senders activate it at ~7-10psi
As Cusser said, there's no reason the 10bar sender wouldn't work with the 7bar gauge, it just wont be accurate.
Depending on the gauge it may even read backwards, just depends on the resistance values it's set for. |
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Q-Dog
Samba Member
Joined: April 05, 2010
Posts: 8699
Location: Sunset, Louisiana
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| Posted: Fri May 18, 2018 5:25 am Post subject: Re: Electric Issue with Autometer Oil Pressure |
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| AceHH wrote: |
| Q-Dog wrote: |
| AceHH wrote: |
| Cusser wrote: |
I would think it would be OK. Your readings might be slightly off from what they'd be with a matched sender, but you're only looking for guidelines/changes.
I have a VDO oil pressure sender/gauge in mine, typically for me its value would be to alert me if oil pressure suddenly was significantly lower or higher than "normal".
With engine warmed up, I get about 10 psi for each 1000 rpm. |
People told me I must have a 7 Bar Sensor with a 7 Bar Instrument or a 10bar Sensor with an 10bar Instrument. |
Do you want the gauge to be accurate? I supoose they would not make 2 different senders, if they are interchangeable? |
Nearly accurate would be enough.
Is it really true, that a 10bar Sensor will not work with that gauge? |
Personally, I don't see the value of an innacurate gauge. Sometimes bad information is worse than no information. 
Someone, somewhere, must have the resistance values for these senders. I would contact the manufacturer and ask: 1) what is the difference between the two, 2) will the wrong sensor work.
Alternatively, why not just get the gauge that matches the sensor you want to use?
_________________
Brian
'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle |
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