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  1. #1
    casual poster
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    Default oil and coolant gauge reading low all of a sudden

    Hi All I have a ht gts Monaro and all of a sudden the gauge that has the oil pressure and coolant temp both needles have dropped oil was 40 now 20 and coolant was 180F now 150F I have aftermarket gauges and they are still reading right any ideas?????

  2. #2
    Part of the furniture gtrboyy's Avatar
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    Dec 2007
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    Default

    Checked the earths in dash & cluster....doesn't take much.

  3. #3
    casual poster
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    Default

    no good thinking maybe the little strap going from the gauges to the main body cheers

  4. #4
    Part of the furniture gtrboyy's Avatar
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    Dec 2007
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    On a mates Monaro the gauges flickered whenever used brakes or even handbrake..found broken earths etc when it got rewired.

  5. #5
    Senior Member
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    Jan 2017
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    Nth Qld
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    Default

    hi
    The gauges are powered from a fused ignition source and go thru the variable resistance sender units on engine [oil andwater temp ] then electrical circuit returns to battery .

    Correct voltage to dash board guage fuse then correct voltage at back of gauges . The earth side , wire from guage goes to senders ,check condition connections .

    That's the basics

    Then check earth straps and connectors at bulkhead if u have one
    Battery to body
    battery to engine block [bell housing bolt near starter motor]
    battery to interior dash board

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