I found this link helpful.
I have a 1997 Chevy S10 2.2 without a Tach.
I bought another cluster with a Tach in hopes of just plug and play, but after reading this maybe not?
I have not tried to plug and play yet. I was looking at the diagram provided which is helpful and read about the white possibly yellow wire I might need to run.
I am not clear if this wire runs from the back of the connector that the Cluster assembly plugs into, that would make sense but where on the cluster end would that be?
A little more detail on each end needing to be connected would be gratefully appreciated.
I hope to try to plug and play in a few days. We see I guess.
Wednesday, February 14th, 2018 AT 1:17 PM