This is a video I made that explains how I installed my tachometer on my 93 Honda Civic. On the video you will see that I put the red power wire for the tach on a clip marked as 3 on the fuse box. Right next to that clip is a clip marked as 2, this clip gains power when the headlights are turned on and is a good spot to hook up the white back light wire for the tach. The clip may be different for other cars but thats how it is for my car.
honda, civic, tachometer, how, to, install, super, tach, rpm, gauge