C3/78 Oil pressure gauge pegged

[Ed P.]

The gauge is pegged all the time. I removed wire at sender still pegged. I removed wire at gauge and still pegged. I removed gauge and on the back are three studs. Sensor,power and the third I assume is ground. I believe the gauge is bad because I have continutiy between the sensor post and the other two post. Does this sound right. Thanks ED

[Wayne W.]

Re: C3/78 Oil pressure gauge pegged

You removed the wire at the sensor, but did you ground it? It works as a variable resistor. The test is to remove it and ground it. This gives full deflection both ways.

[Ed P.]

Re: C3/78 Oil pressure gauge pegged

My understanding is if I remove wire at sensor it should read zero and if I ground the wire it should peg out at max. That is if system is working properly.