Back to cluster swap. Plugs are identical for clusters 1990-1995. Some pins are not used on 1990-1991 clusters. 1992-1995 clusters utilize 2 more pins for the electronic VSS. I got some extra 92+ cluster plugs from the junkyard, removed the two extra VSS wires with pin, and inserted them into the factory 1990 harness in the truck.

The electronic VSS uses these wires from the 92+ plug:

Blue wire on far side of plug





Removed whole





Factory 1990 harness has this pin location, but it is unused, so it is left empty. Here’s the 1992+ VSS wire installed into 1990 harness





Next wire is the green/red on the far side of another plug





Removed whole





Factory 1990 harness with empty pinhole





Green/red wire installed into factory 1990 harness





These wires will run directly to the VSS at the tail end of the transfer case. The 3rd VSS wire taps into GAUGE 12V wire. Will post pics upon completion.

Test run with new cluster. Works great so far. Needs green bulbs.





Mileage is spot on and cluster is functional.