fuel sending unit

Mouse,

With a small software change, the gauge calibrator circuit should do it. This is only an option if you work with electronics. I can send a chip if you build the circuit.
http://www.forabodiesonly.com/mopar/showthread.php?t=264543&highlight=calibrator

Here is schematic.
brother . I appreciate your response but I'm talking about a 70 pro street dart. the biggest electronics in it will be the stereo. unless this is april fools .... took me a min. thanks