Autometer 3 3/4 tach how to install?

[TurboMazda_67]

I bought a autometer tach 3 3/4. i wanted to know how hard it is to install? and does anyone know the wiring diagram for it, what wires go to what. i dont got the haymes manual for my car its a 1998 mazda protege. but i wanted to know how to install it if anyone could give me some pointers, and some info on the wiring, and the diagram for it i would greatly appreicate it. hitt me up on aim my sn is dubbincadillac or pm me thanxs.

-jay