- 115
- 46
- 28
- Location
- Marion, Iowa
Bought mine NIB on epay $90. Straight forward install. Ground to firewall ground post. Hot lead to fuel gauge. Make sure the red/black wires from TACH are attached to the HOT/GRD screw terminals on back of tach and then attach your vehicle HOT/GRD wires to the same locations. Used white and yellow 14GA to tac - xmitter leads. I made sure ground was clean and tight. Made sure I did not cross the xmitter to tach leads. Used test leads to make sure everything worked before hard wiring. (1990 M99