ok i bought a tach from autozone, just a small one i think its sunpro or similar, my truck is a 93' single cab 2wd 22re pickup. the tach has 4 wires, black, white, green and red, i cant find the correct spot to hook up the green wire (rpm sending wire, it says to the neg side of coil but i cant find that??? also were would i hook the red and white to? i read something about hooking it up to the clock wires? mine doesent have a clock but the wires are there. thanks in advance.

 

ok update, the clock wireing works, i wired the power, light and ground into the clock wires. i just need to know were the little green wire hooks into, i cant find a dang negative on the coil????????