Need some help - I need a power source for my PLX Devices Air / Fuel gauge.

The instructions reference -

1) at least 3 Amps of current.
2) power should only be supplied when key is turned past specific position.

If anyone can point out a fuse or a color wire I can tap, it would be much appreciated over my typical trial and error method.

Thks

 

where did you tap for the gauge sender wire? I just installed one and tap to the yellow and then grey wire and both still read top rich, no changes at any interval. I'll appreciate your help..

Alex al618404@hotmail.com 4044099214