Gauge Sender Malfunction or bad Ground?

[caz5511]

I have a set of V1 MadDad gauges. I replaced the oil pressure sender unit about 16 months ago. Recently, I have noticed that at idle when warm, the pressure on the gauge drops to 15-20 PSI, and then "dances around" between 15 and ~35. My oil level is fine, and I don't seem to be having problems when my RPM's are up. Is this a sender malfunction? Or possibly a bad ground? Any other ideas or ways to test what the problem is? Thanks a bunch!

[2:43AM]

Do you have a multimeter to test the electrical signal from the sender to the gauge? If not, I would check all connections, clean and reland your ground connection (if chassis ground) and test the setup again, seeing if conditions improve.

There could be a loose connection, which when it warms up, parts expand and make them even more loose. Idle is when your motor vibrates the most, with larger lower frequency movements.

[DUB]

You wouldn't be the first person to have to replace your MadDad oil pressure sending unit multiple times. I would call 'em up, it probably just died...again.