Fuel sending unit wire?

[dodge68charger]

Im planning on running an autometer fuel gauge as well as my stock gauge.

Can i tap into the stock fuel sending unit wire from the tank for the autometer gauge?

Thank You

 

[dadsbee]

NO

 

[Project66]

I think you'll need to use one or the other. The fuel gauge reads the resistance in the circuit. if you introduce a second gauge, it will disrupt the reading.

 

[dadsbee]

The fuel gauge reads the resistance in the circuit.

The factory fuel gauge reads a VOLTAGE that is reduced by the fuel sender rheostat (connected via the sender wire to the ground side of the gauge) from the full pulsed 5 volts it's supplied by the IVR. Agreed, why you can't hook another gauge in the sender wire!

 

[Project66]

What he said!

Thanks for correcting my misunderstanding. I'm a lawyer, not an engineer so I often have a good, intuitive grasp of how things work without without fully understanding why. I know the resistance changes as the arm on the sending unit moves, but the gauge actually measures the voltage passed through it, not the ohms at the end. It seems so obvious.

"Now I see" says the blind man.

 

[68 Sport Satellite]

so does this mean we can wire multiple gauges to the fuel sending wire and they should all read accurately?
Does anyone have first hand experience with this working?

 

[Bird 426]

Who said that you can add additional gauges?

 

[dadsbee]

If you had two factory OE fuel gauges, properly connected, I don't see why it wouldn't work... but WHY would you?

 

[68 Sport Satellite]

The OP asked if he can leave his stock gauge connected, but also add in a connected aftermarket gauge for greater accuracy. I also want to do this with my car.

 

[68 Sport Satellite]

Who said that you can add additional gauges?

meaning - the stock gauge plus one aftermarket gauge connected to the fuel sending wire.

 

[dadsbee]

meaning - the stock gauge plus one aftermarket gauge connected to the fuel sending wire.

Again, just like post #2, that one is a NO.

 

[Project66]

The operation of each gauge will interfere with the other. Like a fuel gauge Observer Effect.

 

[dadsbee]

Aftermarket gauges generally all work on a steady 12Volts and a different ohm range on the sender for E and F. Most work with the ohm range opposite to Chrysler. None that I know of work on a pulsed 5 volt delivery.