Headlights Tail and Brake Lights
Dashboard Lights and Gauges
Lincoln Mark VII
Grand Prix GT

Why when I turn on the headlights of my 90 mark 7 the fuel gauge and tach stop working?

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Wiki User
2011-09-13 17:04:44

Its a bad ground, but its easy to fix. By the fuse block/hood

open latch (in side the car) there is a bundle of wire, find the

light blue wire, cut it and connect each end to the car body. I did

mine and it works. But quarter tank is now empty, rpm guage is

fine... Hey check out www.lincolnsonline.com and go to the

tech part, and see "dash ground fix" that's how i learned

this very helpfull tip.

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