I don't think there was such a thing as "original" tach wiring for GMC
TF trucks. I base my opinion on the attached page from the Canadian
Chevrolet/GMC Master Parts Book. I assume the US model tach was the
same. Here is what the Parts Book says.
The following #18 gauge wires to be made up locally
- Transmitter Ground
- Distributor to Transmitter
- Transmitter to Head, 2 required
I case you need it, I have also attached a hand drawn schematic for a
Sun EB7A Transmitter (Sending Unit) which is the correct unit for any 8
cylinder 12 volt positive ground gas engine.
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[demime 1.01d removed an attachment of type image/jpeg which had a name of
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