Gauge Sender Malfunction or bad Ground?
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This is a discussion on Gauge Sender Malfunction or bad Ground? within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; I have a set of V1 MadDad gauges. I replaced the oil pressure sender unit about 16 months ago. Recently, ...

  1. #1
    Registered User
    Join Date
    May 2004

    Gauge Sender Malfunction or bad Ground?

    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!

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  3. #2
    Registered User 2:43AM's Avatar
    Join Date
    Sep 2008
    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.

  4. #3
    DUB is offline
    Registered User DUB's Avatar
    Join Date
    Jul 2007
    SLT, CA
    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.

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