did mine a while back, i mounted mine on A pillar, all wiring hooked up to the back of cluster IIRC look on the back of cluster, its labelled albeit abbreviated, so find one named tacho for the signal , +ve/-ve wire run off the back as well, pretty sure will try find the install pics
ok pics attached, u can see for eg, the ignition one, just follow that to the screw and wrap ur wire under that, same for the others