Holley 6.86/ term fuel level
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Joined: Oct 2016
Posts: 86
Likes: 2
From: Clarkesville Georgia
Holley 6.86/ term fuel level
Hey there,
recently purchased the 6.86 dash. Car is on a term x, I am running the stock pcm very minimally just for AC. I have left all fuel related wires connected. Looking at setting up my fuel level gauge on the 6.86, how have people setup the wiring, I know we have 2 level sensors that are resistance based. How have or would you wire it up. The 6.86 has 1 pin for resistance measured fuel level.
thank you for your help!
recently purchased the 6.86 dash. Car is on a term x, I am running the stock pcm very minimally just for AC. I have left all fuel related wires connected. Looking at setting up my fuel level gauge on the 6.86, how have people setup the wiring, I know we have 2 level sensors that are resistance based. How have or would you wire it up. The 6.86 has 1 pin for resistance measured fuel level.
thank you for your help!
Burning Brakes
Joined: Oct 2016
Posts: 1,209
Likes: 363
From: Massillon Ohio
I talked with my trusted electrical engineer at work on this a couple years ago, I believe we looked at just running the sending unit wiring in series and back to the holley dash. Let me look over the diagrams again and I will get back to this.
Burning Brakes
Joined: Oct 2016
Posts: 1,209
Likes: 363
From: Massillon Ohio
This thread has some useful information as well
https://www.corvetteforum.com/forums...post1607694983
https://www.corvetteforum.com/forums...post1607694983
Burning Brakes
Joined: Oct 2016
Posts: 1,209
Likes: 363
From: Massillon Ohio
So what you'd need to do (it should work in theory, just need to figure out the scaling) would be to give the gray of unit 1 (we will say driver in this case) ground from the power tap, take the blue signal wire from that unit to the passenger light gray wire, then the blue signal wire from the passenger to one of the 5v inputs on the holley. Then configure your gauge. Essentially the scale would be 80-500 ohm since it's in series.
Burning Brakes
Joined: Oct 2016
Posts: 1,209
Likes: 363
From: Massillon Ohio
Sorry.. My bad on this one.. It wouldn't take ground from the power tap... You would need a clean ground that the dash would see on one side of the sending units, and then IO 7 on the dash harness which is dedicated for Fuel Level. (5v input with an internal pull up resistor).
