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Toyota Trucks: Truck gauge swap woes

  1. #1
    jake
    Guest

    Truck gauge swap woes

    Alright, I have swapped my gauges and gotten everything working in my 85
    xcab/4wd truck. Swapped in the full gauge setup with speedo, tach,
    voltmeter, etc. I knew about the oil pressure switch situation so until I
    had the correct sending unit, I left the wire unplugged. I purchased the oil
    pressure sending unit from Napa. The new sending unit has the nub on the end
    where the wire slides on, but it has a small tab on the side as well where
    something else should attach. I get nothing when hooking up the wire to
    either of these connectors on the sending unit. Is there another wire that
    should go to the extra connector? Or what gives? Is my oil pressure gauge
    bad? I would think that an oil pressure sending unit would need some sort of
    power as it is not mechanical so should there be a power lead going to the
    extra connector?




  2. #2
    Roger
    Guest

    Re: Truck gauge swap woes

    jake wrote: 

    Usually the sender is just a variable resistance, grounded by the case, one lead to the gauge with then is supplied by a regulated voltage; so many volts/so many ohms = so many miliamps and that'w what the pressure guage reads, its nothing more than a
    small current meter calibrated to read out oil pressure.

    --
    Roger

  3. #3
    Bruce
    Guest

    Re: Truck gauge swap woes

    On Fri, 16 Jan 2004 00:37:43 GMT, "jake" <com> wrote:
     

    Check the paperwork with the sending unit. It might be a
    ground-wire connection, for cars where the switch doesn't ground
    through the threads properly.

    If it's another insulated terminal, some cars have a dual sender
    that has both a gauge sender and an idiot-light switch built in - the
    advantage being the idiot light means "Hey, Dummy! Look at the
    gauges! You have a problem!" ;-P

    --<< Bruce >>--
    --
    Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
    Electrician for Westend Electric - CA726700
    5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
    Spamtrapped address: Remove the python and the invalid, and use a net.


 

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