TBI with factory tach

[Jimbo*]

Can anyone confirm or deny GM putting factory tach in the 1987-91 trucks with EFI? The latest I have seen is 1986.
Is it possible to to convert a 90 model to factory tach, if it wasn't an option?

Thanks, Jimbo

 

[tRustyK5]

i dunno if it was ever a factory option in the TBI era, but I did convert my 90 to tach dash. The only tedious part was trying to isolate which wires that came to the cluster were for the fuel gauge. Then I wired the small fuel gauge directly using bullet connectors on the back of the gauge. The tach itself is a stand alone part anyways, and not only does it hook up just like any aftermarket tach, the connectors on the back of it are labelled.

Rene

 

[thatK30guy]

I've seen a few, in person and pics.

I looked at an '88 or '89 V3500 once for sale and it had a tach. I know it was an unmolested truck because it was a work truck used in the oil fields.

Another member here has an '87 V30 with the tach also.

Those are the 2 most recent ones I think of right off the bat but I have seen others before.

 

[Jimbo*]

Wow! Ask and ye shall receive!!
Thanks guys; I figured it was possible, but now know for sure it can be done. I was unsure if with the (new at the time) TBI distributer and VSS if the instrument cluster could handle one more function.

Jimbo

 

[sweetk30]

the tbi dist wiring has the tach pig tail from the 1 coil wire right there from the factory . so i dont see why not .