08-07-2003, 08:58 PM
I installed A digital 6 Box and pro billit distributor on my 69 AMX 390 c.i. motor. All is well But the factory tach in the dash quit working. I tried a direct wire from the tach output of the box direct to the tach, but the needle just jumps once at the moment of contact and then quits. Instructions say I may need a tach adapter 8920 but I'd like to know before I shellout another fifty bucks or so. Help ! I'm Drowning In a sea of MSD.!!!