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wiring gauges

having a blond moment......

 

where the temperature and pressure sensors have 2 wires (signal and ground) the drawing that came with the sensors show 2 wires running from the sensor to the gauge.

 

is there any reason why i can't just run the signal cable and ground the sensor to the chasis in the engine bay and the gauge inside the car?

[sIGPIC][/sIGPIC]

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    Can't see any reason - mine only showed one cable to the sensor, but I can't even remember what make they were!

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    I think it depends on what sensors you are installing.

     

    Sometimes the ECU will send a constant earth and fire on live (i.w. injectors work this way) and other times it will send a constant live and fire on the earth.

     

    I can confirm that with Boost, Oil Pressure and Oil temp, I grounded them all through the same earth wire and it seemed to work ok.

     

    Not sure if fuel pressure, tach, water temp and other gauges will work the same though.

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