1992 Sentra tach???

I have recently purchased a tach for my new nissan and i wanted to know which wire i need to hook the main wire up to. I know where the positive wire goes then the negitive and even the dimmer wire but the last one hooks up to one of the wires on the distributer. Is it the black one witht he red stripe? Any help would be greatly appreciated. Oh yeah does anyone know what a safe rpm is on a car like this?
Thank You

u hook up the signal wire to the green wire on ur coil

fredo