I'm not trying to second you guess you here or anything but I got a few questions.

If I put that in with all the lights, brake, oil, CEL, seat belt, battery, and the O/D etc., all still work or will I have to move bulbs around?

Also my other question is how will it work since it wasnt designed with a tach in it. The connectors back there and just fit into both cluster or something?

thanks