If you don,t want it factory wiring I used the idiot light curcuit board and just wired the temp and oil gauges seperate to gauge sending units my clock didn,t work so I never did that wiring but left the clock in anyway. If you want to re-pin the the harness I think this the thread.
http://67-72chevytrucks.com/vboard/s...d.php?t=452340