Anyone know were to Buy an Aftermarket gas Guage. My truck (79 F250) has the old style tank (The kind that was installed behind the seat), only now it's external. there are 2 wires coming out of the tank. One is a ground, and the other goes into a harness that is a mess. I was hoping to find an aftermarket guage that would work.

 

You might have to go with a whole new sending unit and gauge combination to have it work properly.

If you can ohm out your existing sender you can then see if anyone makes a compatible gauge, otherwise AutoMeter does make both senders and matching gauge set-ups.