How do you install a super pro tachometer on a 1991 Chevy blazer?

Answer 1

there should be a screw on the back of your tach, remove screw and cover careful not to pull the wires. there should be a switch labled 4,6,8 for number of cylenders. put it on six if that's what you have. red wire goes to switched 12v (best bet is on yourr fuse panel), white wire goes to instrument cluster light switch, black is obviously ground, and the green wire goes to your coil. if your blazer has the 4.3 your coil should have two harneses each with two wires. one set of wires, red and white(closest to the firewall) goes to your distrubuter. the other harnes should have a red wire and a white or tan wire. the white wire farthest from your firewall (on the right side of the coil) is where you should connect your green wire. hope this helps