Fuel sender converter, it convert any resistance fuel sender to new or old gauge. 

For example, it can convert: 

GM: 0-30, 0-90, 40-250 Ohms

Ford AMC Mopar 73-10, 16-158 Ohms

Stewart Warner, Autometer 240-33 Ohms

VDO 10-180 Ohms

Any unknow fuel sender

It even can convert any unknow fuel sender to any gauge. The way it works is it calibrate the gauge reading and fuel high low level independently, then make they corrodingly as a linear relation. It assume the fuel level and gauge scale has a linear property though.

Input range: resistance, up to 2,000 ohms

Output to gauge, PWM 0.0 – 5.0V.

Calibration is easy, just set gauge zero, gauge full, fuel level low, fuel level high 4 set points and it works.

Manual download:

http://intindustry.com/files/Fuel_sender_converter.pdf