[Russell]

I cannot remember, do the 87 trucks have an electric speedo? Cause that could cause you some difficulty...

This tach replaces the big fuel gauge, and the fuel gauge is moved down to the bottom-left most hole for the small gauges. You'd need to run three wires to make the tach work, one that goes to the tach terminal on the HEI, one that runs to 12 volts on crank and run, and one to ground.

If you are able to do some electrical work and have a die grinder you can easily modify most bezels to accept the fuel gauge and the tach without having the wiring on the back. You just need to run some wires from the fuel gauge's poles straight to the wiring harness like you would with the tach.

I am using a non-tach housing for my truck becuase the tach housing I originally got was a peice of junk, it isn't the prettiest job cause I used a pair of cutting pliers to cut the backing out, but it was quite easy to do overall.