1988 ford f150 tachometer problem
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4wd Low
Joined: Jun 2025
Posts: 14
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1988 ford f150 tachometer problem
I have a 88 ford f150 5.0 and we got the truck and it was efi and had a blown head gasket so we fixed the blower head gasket and put a carburetor on it with a new different distributor and I have a ton of cut wires the are coming from the cab and I have a green wire coming out of the distributor I know that’s for the tachometer and my question after all that is what’s the color of the signal wire coming from the rpm gauge and do I just connect it to the green wire coming out for the distributer ? Thanks!!
Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
It should a be dark green/yellow wire coming off of the ignition coil connector. This will go through a resistor in the wiring harness.
I don't know the distributor you are using so I can't help with wiring that into the truck.
I don't know the distributor you are using so I can't help with wiring that into the truck.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
The factory tach on the V8 trucks had a series limiting resistor for some reason. That resistor is located in the engine bay. An aftermarket tachometer most likely does not require that resistor. Refer to the OEM documentation.
Refer to the OEM documentation.
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