Found it! Thanks a lot for the help from Rbt and Jeff(who sent e-mail). My pump is a Bosch but the two black wires were there.

Probaly was cut when the engine was overhauled.
I will have to check if the sensor works or not. How do you test this? Is it a hall device?

I'm not sure either about it being non-polar or not. The diagram shows one side to ground and the other end connected to the Tach. Don't want to damage it.

Thanks

Boyd

Boyd
86 Isuzu Trooper 2-door C223
82 Isuzu Gemini Coupe 2.3 G200