I currently have an Autometer fuel pressure gauge, AND a Quadzilla railpressure gauge. I want to eliminate the Autometer and have both read by the Quadzilla. I spoke to QZ and the sending unit they used to use is no longer available, a single terminal sender that the ring terminal on my current harness would attach to and thats all it needs. My question is, does anyone know if its possible to use the gray wire from the autometer sending unit (3 wire sending unit, red and black are + and -) as a source for the Quadzilla? I'm tempted to just try it, but I don't want to damage the Quadzilla.....