Just got a autometer monster tach from a friend and was wondering
if anyone can tell me how to install it…thanks
Into what car with what engine?
open nearest garbage recepticle
insert.
carry to street.
its going into a 92 240sx coupe…stock ka24de
Either do what Sasha said 
-Or-
If you are hell bent on using it, connect the signal wire to the negative on
the coil. Connect the power and ground to their respective wires