Tach cluster

[ray_mcavoy]

Originally Posted by DBLSPRT68

GET THAT CLUSTER!!!!!!!!!!! You can sell it to someone $$$. I had an 84 C40 dash cluster in my old 83 C20. It is a plug and play cluster for 78-87 chevy trucks. I say 78 because, before then; there were differences in the wiring. I actually removed the air guage and put the factory clock in the hole. Everything worked perfect for several years. Then pulled it and sold the truck. It will go in my Suburban next.

I agree. That 86 C70 cluster should be a direct swap into a 78-87 pickup, Suburban, or full-size Blazer/Jimmy that was originally equipped with a full gauge cluster. It might have some different warning/indicator lights at the bottom of the speedometer than what would be found in a pickup truck but those are easy to swap the little colored lenses if necessary. It would require changes to the wiring if used in an earlier year (73-77) pickup or any 73-87 that was originally equipped with a warning light cluster instead of gauges.

The air pressure gauges are probably quite popular with folks using air ride suspensions or like DBLSPRT68 said, can be swapped for a clock. That's something you can't do with the stock 10-35 series tach clusters because the small fuel gauge is located in that lower/left corner instead of in the bottom of the tach.

When you pull the cluster, get the 3-wire harness that plugs into the back of the tach too. The other ends should just plug into the fusebox and ground buss near the lower corner of the dash (near where a pickup parking brake pedal would be). And one wire goes through a grommet in the firewall. With a diesel engine, these tachs operated off a magnetic sensor that reads off the flywheel teeth. I think they can be converted for use with a gas engine by changing the calibration resistor on the circuit board.