Msd Tach Adapter 8920.

[1976 TN Porsche]

I have just put a crane optical trigger with msd in my distributor. It is working fine but I cant seem to get the tach to work with 8920 tach adapter. Can anyone help with wiring. How have you wired yours. Thanks.

[Walter_Middie]

I didn't need a tach adapter with my MSD. I don't have a Crane optical - I have a Pertronix, but that shouldn't matter as the signal comes from the CDI.



The tach can be connected by running a wire directly from the new MSD unit tach output, to the black and purple stripped wire side of the white connector for the old tach connection in the engine compartment.

[1976 TN Porsche]

I had A pertronix and with it I had to use a msd 8910 tach adapter. The crane optical trigger says to use a msd 8920 tach adapter but I can not seem to get it to work. I have hooked the tach wire black and purple strait to the msd tach port but it does not work either. Thanks.

[tomeric914]

Which MSD CDI box are you running?

What tachometer do you have?

If you are triggering an MSD Blaster, 5, 6, SCI, or 7 Series Ignition with its white wire or points terminal, you will need the PN 8910 Tach Adapter.

If you are using the magnetic pick-up input (green and violet wires) to trigger your MSD Ignition, you will need the PN 8920 Tach Adapter.

[larrym]

in my 914-6 - i have a pertronix with msd 6A - i use the adaptor - works fine

[1976 TN Porsche]

I am using a msd 6A pn.6200 and blaster2 coil. Am trying to use a 8920 tach adapter because the crane optical trigger instructions say to use that tach apadter and not a 8910.

[tomeric914]

Originally Posted by 1976 TN Porsche

I am using a msd 6A pn.6200 and blaster2 coil. Am trying to use a 8920 tach adapter because the crane optical trigger instructions say to use that tach adapter and not a 8910.

Ok, thanks:

Red - to switched power.

Black - to good chassis ground

Violet - to the tachometer

White - to tach signal from MSD

[1976 TN Porsche]

Thanks Tomeric914. I will try that set up.

[tomeric914]

Originally Posted by 1976 TN Porsche

Thanks Tomeric914. I will try that set up.

No problem. I know for certain that's how mine is setup but that's with a stock magnetic trigger distributor. Let me know if you need pictures or any other details.

[1976 TN Porsche]

Thanks Tomeric914. I wired it that and it still did not work. Does anybody have a Crane Optical Trigger Running msd and a 8920 tach adapter. If so how did you wire up the set up. Thanks.

[tomeric914]

Did you just install the Crane optical trigger or have you had it on the engine for a while before you changed to the MSD?

Does the crane have some sort of indicator light to show that it is working?