oil pressure gauge problem

[DeathProofCuda]

Death Proof...I can buy the tool...but I dont have experience to use it. My mechanic is busy right now, and doesnt have time to fix this problem. I just wanted to be sure I had good oil  pressure.

@antonellomopar
Just buy the tool and I think you'll find many folks here that will walk you through how to perform various tests with it.  Once you get accustomed to using a mutlimeter you'll wonder how you ever lived without it.

If you don't understand them already, read the attached Chrysler tech reference manual on how thermal-electric gauges work.  In addition to the basics of how these gauges work, it also includes a bunch of great information on troubleshooting these gauges.

Sending unit are just variable resistors that operate within a range of approximately 10 to 80 ohms.  In the example of your oil pressure gauge, if your oil pressure was very high the resistance through your sending unit would be about 10 ohms, therefore more current will flow through your oil pressure gauge which will cause the needle to move to the high side of the gauge.  If your oil pressure is low, the resistance through the sending unit will be higher and less current will flow through the gauge so the needle will read lower.  With an operating range of 10 to 80, your mid-point will fall somewhere around 40 ohms.  Therefore you can see that just 30 ohms of additional resistance in your circuit will cause your gauge to read low even if your oil pressure is normal.  You need the multimeter to find out where that additional resistance is coming from.  Could be as simple as some corrosion on a wire connection.