sitnlow4life

So I'm doing a fuel cell in my 92 pickup
I want to use the stock fuel gauge still

I know the stock sending unit reads 3 ohms full and 110 ohms empty as per the FSM.
As for aftermarket senders there is nothing for Toyota
Only thing close to that range would be a GM unit that reads 90ohms full and 0ohm empty.

Is there a way to manipulate the GM sending unit to read the resistance value I need using resistors ?

Any help or feedback would be greatly appreciated

Thanks

scope103

Since the resistance runs the other direction on the GM unit, resistors alone won't convert the signal to what the stock fuel gauge wants. It would not be hard to do this with an op-amp, assuming that words "with an op-amp" are meaningful to you.

Since the resistance range is pretty close, you could wire it right up, and as long as you remember the gauge reads "backwards" you would be fine.

I assume you are replacing the stock fuel tank with a fuel cell, and the GM sending unit is what fits the fuel cell?

sitnlow4life

Yes the fuel cell comes with GM sending unit
I am pretty knowledgeable when it comes to most things 12volt
I have never heard of the term "op-amp" before
Could you give me a brief description
Thanks

scope103

http://en.wikipedia.org/wiki/Op_amp
While it sounds a little daunting, a suitable op amp costs about $0.45. And you'd need about another $.50 of resistors, then a breadboard, etc. So if you've never heard of an op amp, there might be a bit of a learning curve for you.

Punchy

Or, just use resistors and remember when using that tank that your fuel gauge is backwards.