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Testing oil pressure gauge

1982 SC- I had observed that the gauge was really only utilizing the 3-5bar range so I replaced the sending unit. I still get similar readings and would like to rule out the gauge. When I pull the wire on the sending unit it pegs to 5. I have read that you can use a potentiometer wired in to try to sweep the gauge.

Can anyone give me a how to? Would a 500ohm potentiometer work for this and what is the sequence to hook it up?

Various threads site different values and methods, so I am trying to confirm.


Thanks!!

Will
Old 11-04-2018, 03:56 PM
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ROW '78 911 Targa
 
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Connect potentiometer between sending unit wire and ground.
Ignition on.
Turn to zero it will go to zero.
Turn to max it will peg out.
Not knowing sender resistance maybe go bigger like 10K ohm pot.
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Euro 1978 SC Targa, SSI's, Dansk 2/1, Bitz kit EFI.
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Old 11-04-2018, 04:39 PM
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I don't have your exact car but I get around 1 bar at idle.
I think that's hot idle.
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Old 11-04-2018, 04:42 PM
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Quote:
Originally Posted by timmy2 View Post
Connect potentiometer between sending unit wire and ground.
Ignition on.
Turn to zero it will go to zero.
Turn to max it will peg out.
Not knowing sender resistance maybe go bigger like 10K ohm pot.
The pots I have are three pronged. Should I connect middle prong to sending unit wire and ground one of the other prongs?
Old 11-04-2018, 04:43 PM
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ROW '78 911 Targa
 
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Use an ohmmeter and determine which is common (usually center) and which terminal(s) is variable.
Connect the common to ground and the variable to the sender wire.
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Dennis
Euro 1978 SC Targa, SSI's, Dansk 2/1, Bitz kit EFI.
Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds.
Old 11-04-2018, 04:49 PM
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Thanks Timmy. Iíll report back for others once I rig this up and test.
Old 11-05-2018, 04:18 AM
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Ground the sensor wire and it should read 0.
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Old 11-05-2018, 06:30 AM
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