1976 2.7 911s MSD 8910

[SunburntLobster]

Boosted by recent success of getting the car running will I have decided to tackle the nonworking VDO tach:

MSD 6AL 6425
123 Tune USB distributor
BitzEFI megasquirt ms1

The 6AL is triggered by the white wire, magnetic pickup not used.

I have sketched how it is configured with question mark on how the VDO tach wire should be connected.

[rwest]

I didn’t need a tach adapter for my ‘77, not sure if you need it either.

[SunburntLobster]

VDO tach doesn't work if connect to MSD grey. The 8910 doesn't seem to have helped either!

[rwest]

I just looked at my MSD box on the shelf and I have the blue wire cut and the grey wire was used for tach.

Are you sure your tach even works? I think you said that the PO didn’t have everything set up very well?

[rwest]

Quick note: if your Bitz is working off of the grey wire, your tach should too.