Join Date: Mar 2002
Location: Austin, TX, USA
John, I didn't respond to your post because I didn't have my schematics in front of me. I mapped out the instrument cluster and cables some time ago. I'll have to check back with you later this evening. I'm pretty sure I know which three unused positions you are talking about. If so, they are used in a manner of speaking. The three or four terminals are shorted together and provide power for the dash lights if I'm not mistaken. Like I said, I'll verify and get back to you.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI