MSD wiring to tach adapter

[DynaBro]

Tach does not work. Red and white wires off tach adapter PN 8920 go to nothing.

White wire off MSD 6A PN 6201 go to nothing.

Any ideas?

 

[coloradodave]

For your viewing pleasure: https://www.mpsracing.com/instructions/MSD/8920.pdf

 

[DynaBro]

For your viewing pleasure: https://www.mpsracing.com/instructions/MSD/8920.pdf

NICE.

 

[DynaBro]

Actually 6AL and my 6A wiring don’t jive.

 

[DynaBro]

And the best coming from the MSD is going nowhere as well.

 

[Billccm]

Troubleshooting video and theory.

Restoring Tach for 68 Road Runner – Project BeepBeep

 

[kiwigtx]

And the best coming from the MSD is going nowhere as well.

Maybe some visual aids might be in order here......

 

[DynaBro]

Ok so I connected the White to the White, and the Red from the tach adapter to the Gray form the MSD. Nothing. Then I left the Gray bare and connected the Red from the tach adapter to a hot fuse box. Still nothing.

 

[DynaBro]

Got it sorted. Tach works and I’m pretty happy. One victory. Tuesday the oil pump is on deck.

 

[coloradodave]

Got it sorted how? The answer might help the next guy...

 

[DynaBro]

Got it sorted how? The answer might help the next guy...

The gray from the MSD went to the white from the tach adapter. I ran the red from the adapter along the firewall to the other side of the engine bay and mated it with two other thick red hot wires mounted to the small lower block left of the master cylinder. I’m hoping that’s the same as splicing it into an ignition wire. Anyway it worked.