Supercuda's on the way back...after18 years!
Success!! Tonight I disassembled the gauge cluster and drilled and tapped the holes for the heater control bolts for 1/4 -20 studs. Re-assembled the cluster and re-installed it. Hooking up the heater controls and cables took about 5 minutes!! I fooled with this for about two hours Saturday with no results. The modification I did took about 20 minutes and worked perfectly!
Strongly recommend doing this if you have the cluster out. Your poor scratched and gouged arms and hands will thank you!!
Hope this helps somebody else!!