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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: guinelle1 on January 15, 2014, 04:29:14 pm

Title: adding an aftermarket fuel gauge
Post by: guinelle1 on January 15, 2014, 04:29:14 pm

i have a 79 k20 with an oem tank on the passanger side. the truck is stripped and set up for mud drags.. when i got it none of the gauges in the original cluster worked, and the fuel gauge would move with the turn signal lol... i tried another cluster and no go. is the sender on these trucks 0-90 ohm? i couldnt find much surfing online. i tested my sender and it seems to be working.

Title: Re: adding an aftermarket fuel gauge
Post by: bake74 on January 15, 2014, 08:24:08 pm

     http://forum.73-87chevytrucks.com/smforum/index.php/topic,16071.0.html

     Yes, most stock fuel gauges are 0 - 90'ohms.

Title: Re: adding an aftermarket fuel gauge
Post by: bd on January 15, 2014, 09:22:28 pm

Quote from: guinelle1 on January 15, 2014, 04:29:14 pm

i have a 79 k20 ...and the fuel gauge would move with the turn signal lol...

Check all of the vehicle grounds, especially the instrument cluster, cab and bed grounds.

Title: Re: adding an aftermarket fuel gauge
Post by: guinelle1 on January 16, 2014, 07:04:24 am

ill check the grounds but im gunna order the aftermarket gauge

Title: Re: adding an aftermarket fuel gauge
Post by: 75gmck25 on January 16, 2014, 05:27:51 pm

If the turn signals make the fuel gauge flip back and forth, its almost always the main instrument panel ground.  There should be a black wire from the cluster grounded to a post on the emergency brake mechanism (which then grounds it to the body).

Bruce

Title: Re: adding an aftermarket fuel gauge
Post by: guinelle1 on January 16, 2014, 07:02:26 pm

wow thanks for all the responses ill make sure to check that ground. great community on here  :)

Title: Re: adding an aftermarket fuel gauge
Post by: rich weyand on January 16, 2014, 07:11:33 pm

If the ground isn't right, the aftermarket gauge won't work either.

Title: Re: adding an aftermarket fuel gauge
Post by: guinelle1 on January 16, 2014, 07:37:58 pm

Quote from: rich weyand on January 16, 2014, 07:11:33 pm

If the ground isn't right, the aftermarket gauge won't work either.

i would end up bypassing all the factory wiring, because i have no idea if any of it is any good.