Stock gauge question? 1985 Mustang GT - Ford Mustang Forum

 
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post #1 of 5 (permalink) Old 04-15-2008 Thread Starter
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Stock gauge question? 1985 Mustang GT

I have an 85 GT and it has the orginal gauges but the fuel and temp act strange sometimes...like yesterday i was driving home from work i hit a bump my gas gauge was on empty light on and they went to 1/4 tank...I looked at the temp gauge it was almost on the red....most of the time the temp gauge reads in the middle or a little lower...What is the normal position for the stock temp anyways? What is causing this? loose wire...ground????


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post #2 of 5 (permalink) Old 04-15-2008
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Just sounds like the cluster is going....Most cars run in the midle with temp. but not all


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post #3 of 5 (permalink) Old 04-15-2008 Thread Starter
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Quote:
Originally Posted by White_X3_LE View Post
Just sounds like the cluster is going....Most cars run in the midle with temp. but not all
Thanks for that info mine is in the middle most times....what do you mean the cluster is going bad?

DD 2003 Excursion turbo diesel, 04 Trailblazer,other toy 06 300 SRT8 98 GMC burb.
Wifes toys, 91 Z28 350 tpi supercharged,89 Iroc-z 350 tpi.
1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold 85 GT sold 87 GT vert sold.


NOW 92 GT wild strawberry, BBK headers,off road H-pipe,flowmaster cat back,AOD shift kit,3.55s more to COME.
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post #4 of 5 (permalink) Old 04-15-2008
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I'd say the sending unit has issues.

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post #5 of 5 (permalink) Old 04-15-2008
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It's the IVR (instrument voltage regulator) that is attached to the rear of the cluster, just behind and between the oil pressure and fuel level gauges. The contacts inside the IVR aren't breaking like they're supposed to and the gauges are being sent too much voltage, causing them to spike.

When that happens rap on the instrument cluster's plastic face with your fingers or knuckles and the gauges should return to normal.

Buy a new IVR and install it OR build your own that puts out +5.0v to the gauges.

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