90 coil pack with attached tachometer filter

91+ coil pack, no tach filter

Take filter off prongs and put it on the 91+ coil pack.  I don't think it matters which side what color goes to. It's getting the same signal.

Run a wire from the white tach filter wire to this connector.  Click on image to enlarge. The white wire is the factory tachometer input wire to the cluster

Exciting!! :)  Forget about all that BS about using a 90 coil pack, ignitor, ECU, blah blah. This is all you need.