Here is what i found helpful and did today... didnt see any good posts with pictures here so the Pictures show exactly where i installed all the wires. Green/ Tach signal. White/illumination. Red/ Power. Black/Ground. The Green wire gets spliced into the Yellow/brownish wire on the negative side of the coil.. The one im pointing at. White and red wires can be plugged into the fuse box i took a few tries but this combo pictured worked the best, Black wire can be hooked right up above the clutch there is already a drilled hole. Tach works great and i mounted it on the left side there so its out of the way of everything and i didnt have to remove much to drill a hole and tighten down the nut and bolt for the bracket. All together a 15min job.

 

What kind of truck?

 

93 f150 5.0

 

Oh good grief... do that wiring up right! Here, buy yourself a couple of these:

 

Well then.. Never seen or heard of those!