Question about 1984 Pontiac Fiero

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1984 FIERO 4 CYL STICK. had a aftermarket elec temp gauge mounted on console, replaced with a mech temp gauge. after replacing temp gauge is when the fuel gauge messed up. now when you turn on the key or start it the gauge goes past the full mafk an stays there.NO wires to the dash were touched. the light wires on the gauge are the same ones used on the old aftermarket gauge.. what could have happened? The gas gauge worked fine before. the reason I change the temp gauge was the sending unit went bad an I couldnt get another one so I bought the mech type gauge...HOW do I test to find the problem an fix it. My son in law is giving this car to his daughter to drive, she just got her license (not wise) please help figure this one out THANK YOU

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I assume you replaced the temperature sending unit when you installed the aftermarket gauge? You need to put the proper sending unit back in for the OEM gauge to work.

You can find a sending unit here (and a gauge if needed):

http://www.fierostore.com/

Hope this helps

Posted on Feb 14, 2011

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