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Old 07-26-2012, 05:29 PM   #1
54Caddy
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fuel gauge

So im working on another truck and the fuel gauge isnt working shows way past full. The truck has a fuel cell and was wondering how do i test the sending unit for correct ohm readings. Also i noticed in some wiring diagrams that the fuel guage goes from pin 7 to 18 so i took a look at a few clusters i have and they deffinently do. 7 to 18 has a jumper wire between the two. pin 7 has another tan wire going out past the cluster. Now i want to just hook up a new wire on that end and run it back to the tank would that work?
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Old 07-26-2012, 07:39 PM   #2
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Re: fuel gauge

mod please move this to electrical thanks
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Old 07-26-2012, 10:18 PM   #3
motornut
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Re: fuel gauge

7 is alt light if it's idiot lights, 18 is big fuel gauge no tach
with tach it makes the 7 the fuel small gauge

my 78 with idiots
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Old 07-26-2012, 11:52 PM   #4
54Caddy
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Re: fuel gauge

Yeah this one has the big tach. Fuel gauge goes from 7 to pin 18
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