WIRING Identification Issues

[koolsportster]

I recently acquired a 2007 Mercury 90 h/p EFI 4 stroke motor. I was running a 1998 Mercury 150 h/p 2 stroke. I bought the wiring harness adaptor to accomodate new motor with older control. I am trying to wire guages but have no idea what wires are for what. Can someone please convey the id's for the fuel, psi, battery, and tach. Thanks again as always!

 

[Chris1956]

Re: WIRING Identification Issues

Ok Power for the gauges will come from the purple wire. All gauges need a ground wire, which is black. The tach sender is grey, the voltmeter uses purple and black. The Pressure gauge doesn't use power to function. If you have a dash-mounted navigation switch, this should power the gauge lights, or you can wire them to the purple wire as well.

The sender for the fuel gauge has no standard color. Look at the tank and trace it out.