89-95 Instrument Cluster - Need Tach Wire

I have just aquired a 92 Pickup, and have found a cheap inst. cluster
w/ a tach, but i don't have a wire diag. for the 4 plugs to add the
tach wire in. can anyone assist in my modding?
or give me a place to start... from ignitor to cluster....
thanks for any help..

The tach usually gets signal from the negative side of the coil, maybe
some of the other wires are batt + and ground. I found some pretty fair
wire diagrams on autozone site earlier.

The tach usually gets signal from the negative side of the coil, maybe
some of the other wires are batt + and ground. I found some pretty fair
wire diagrams on autozone site earlier.

The tach usually gets signal from the negative side of the coil, maybe
some of the other wires are batt + and ground. I found some pretty fair
wire diagrams on autozone site earlier.