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Old Aug 31, 2010 | 03:37 PM
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New Fuel Gauge....

I need a new fuel gauge, to go along with my cheap sunpro gauges i have...Does anyone make one that uses the same ohm range as my 78 F150 does?

I was also wondering, was that a resistor on the back of the original instrument cluster? That little box thing that the printed circuit for the fuel gauge runs too, its like the size of a tootsie roll?
 
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Old Aug 31, 2010 | 03:41 PM
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Originally Posted by RangerHaywood
I was also wondering, was that a resistor on the back of the original instrument cluster? That little box thing that the printed circuit for the fuel gauge runs too, its like the size of a tootsie roll?
If you are talking about the little box that has a plug that looks like a 9v battery, thats the instrument panel voltage regulator.
The gauges won't function correctly if its not working right.
 
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Old Aug 31, 2010 | 03:57 PM
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Oh? I still have it...but would i need it if anyone made a gauge for our trucks?
 
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Old Aug 31, 2010 | 03:58 PM
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I tryed using the guts out of the old gauge and siliconed the new sunpro face on to it...but i dont think its gonna work because the sunpro has just a little bit larger sweep
 
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Old Aug 31, 2010 | 04:02 PM
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If you're using the "guts" of the OEM fuel gauge then yes, you need to keep the IPVR for that one gauge only. The other (aftermarket) gauges, if they're electric use a full 12v for power, if they are mechanical it doesn't make any difference.
 
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Old Aug 31, 2010 | 04:14 PM
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ok, does anyone make a aftermarket gauge that works on our trucks ohm range?
 
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Old Aug 31, 2010 | 04:26 PM
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Pick out which gauge you would like to use and contact the manufacturer and ask them if the gauge is compatible with the stock sending unit.
 
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Old Aug 31, 2010 | 05:48 PM
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The stock sending unit out of my truck? Ok, but do you know what ohm range our sending units use?
 
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Old Aug 31, 2010 | 06:42 PM
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Originally Posted by RangerHaywood
The stock sending unit out of my truck? Ok, but do you know what ohm range our sending units use?
I'll see if I can find what the range is and let you know.
 
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Old Aug 31, 2010 | 06:49 PM
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ok thanks mike! i think its 10-70ohms IIRC
 
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Old Sep 1, 2010 | 10:42 PM
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Originally Posted by RangerHaywood
ok thanks mike! i think its 10-70ohms IIRC
Thats correct. According to the shop manual, full is 8-12 ohms and empty is 60-86 ohms so 10-70 ohms is right in the ball park.
 
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Old Sep 2, 2010 | 02:59 PM
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Hey mike....what about this gauge? I know it has a 0-90ohm sweep, but this is the only closest ohm range gauge...if it put it in, and hooked it up, since it has a larger sweep, wouldnt it tell me(when its truly full) that it would be just under full and (when its truly empty) it would tell me i had more?

http://www.summitracing.com/parts/ATM-4314/
 
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Old Sep 2, 2010 | 05:09 PM
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Originally Posted by RangerHaywood
Hey mike....what about this gauge? I know it has a 0-90ohm sweep, but this is the only closest ohm range gauge...if it put it in, and hooked it up, since it has a larger sweep, wouldnt it tell me(when its truly full) that it would be just under full and (when its truly empty) it would tell me i had more?

Auto Meter 4314 - Auto Meter Ultra-Lite Analog Gauges - Overview - SummitRacing.com
The ohms range would probably work like you said, a little above E when its empty and I think it would be close enough that it would read F when full. The one thing I don't know is how the sending unit in the tank will handle the extra voltage. The gauge uses 12v and IIRC the Ford gauge uses 5-6 volts.
I don't know if this would burn out the sender or not, my guess is it would but not sure.
 
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Old Sep 2, 2010 | 06:25 PM
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Ugh, this is going to be a PITA trying to find one that will work...do you know of any others that are at almost a direct replacement for the original?
 
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Old Sep 2, 2010 | 06:35 PM
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The 0-90 gauge will give the opposite reading as the OEM Ford gauge which is 70-10, EMPTY TO FULL.

So, in other words with a full tank of gas the gauge will say EMPTY, as you drive the gauge will progress to FULL.

Wish it worked in real life like that.

The 0-90 is the Chevy system. Ford is opposite.

Autometer makes Ford specific Fuel gauges... part number 5416 for the Pro-Comp Series

Josh
 
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