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Thread: 75 firebird guage wiring
          
   
   

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  1. 02-23-2021 05:45 PM #1
    firebird77clone's Avatar
    firebird77clone
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    75 firebird guage wiring

     



    very specific query

    For my 75 firebird oil pressure guage:

    Does the guage receive full voltage, and ground through the pressure switch?
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  3. 02-23-2021 06:34 PM #2
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    Most gauges receive +12VDC directly (as marked on the gauge "+"), some gauges use a resistor to stabilize voltage and limit current to the gauge. The -12VDC (as marked on the gauge "S") is connected to the sending unit suppling ground to the gauge via resistance.
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  4. 02-23-2021 08:33 PM #3
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    it should be using a plastic circuit board that the wiring harness is plugged into. I’ve seen the circuit board go bad & the plug to it have broken wires or a bad connection with.
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  5. 02-24-2021 07:23 AM #4
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    Quote Originally Posted by firebird77clone View Post
    very specific query

    For my 75 firebird oil pressure guage:

    Does the guage receive full voltage, and ground through the pressure switch?
    Your wording is very confusing to me. You say "gauge" but then you ask if it grounds "...through the pressure switch"? That sounds to me like an oil pressure indicating light (aka the "Idiot Light"), not a gauge? If it's a gauge you'll have an oil pressure sending unit, not a pressure switch, right?
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