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oil pressure sending unit resistance

5K views 8 replies 5 participants last post by  Mortgage-payer 
#1 ·
I have been trying to get gauges working on my 1976 cj5 with 258 engine.

The original? sending unit registered 262 ohms with the engine off. With the engine idling, it went to 0 ohms.

I decided the sending unit must be bad, so I bought an Omix-ADA sending unit. It registers 64 ohms with the engine off. With the engine idling, it also went to 0 ohms.

Is it possible that my oil pressure is high enough to drive both sending units to 0 ohms with the engine idling?

Thanks in advance for any help.
 
#2 ·
At this point, I would install a mechanical gauge just to check your actual pressure.
It could be possible you have exceeded the range of the sensor.
In either case you would have to be over 80 PSI

The sensor would be either:
0 PSI = 234-246 ohms
20 PSI = 149-157 ohms
40 PSI = 100-105.5 ohms
60 PSI = 65-69 ohms
80 PSI = 32.5-34.5 ohms

or:
0 PSI = 68-78 ohms
40 PSI = 21-25 ohms
80 PSI = 7-13 ohms
 
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