just chipping in info
the brakelight switch that goes on the break peddel bracket is diff from the 87 &v switch
- I can't remember off hand how but the mount bracket for it may also be diff
when I swaped in the 88 engine and dash harness I needed to go back to the wreakers for the switch and bracket
also , on the 88 wireing the brake light switch plug to the harness is on the engine side of the 60 pin conector - that would be one of the plugs on your engine harness just at the 60 pin