Which Tach Adapter for MSD Ignition & Factory Tach?

[PurpleBeeper]

I'm running a MSD ignition box & a factory (dealer) Dixco hood tach. The tach doesn't read right & I believe I need a MSD tach adapter, but which one?

The 8920?

or the 8910?
THANK YOU!

 

[Wietse]

I have a MSD RTR distributor with a MSD blaster SS coil and use the 8920 and works well.
Depending on what ignition box you are using you might need the 8910, see below links with info where it states how/what type you are running.

https://www.msdperformance.com/products/accessories/tach_adapters/parts/8910

https://www.msdperformance.com/products/accessories/tach_adapters/parts/8920

 

[PurpleBeeper]

I'm no electrical whiz and I installed the current MSD 6A about 30 yrs. ago, so I honestly don't know how I am triggering it (white wire or points terminal OR green/violet wires). How would I know? The wires attached to the distributor pickup? The car has a factory-style (direct connection) '72-'74 style electronic ignition. I'm try to install a bunch of MSD electronics & I have no idea what I'm doing. The tach adapter is step #1. Thanks for any help you can give me.

 

[Wietse]

You can also check the individual installation instructions provided on the links i send how to connect.
If the wiring colours match your setup you might be able to figure it out.
I am not sure what type of rpm gauge you have, either voltage or current triggered type.
Also found below site for modifying your Dixco tach to work with modern type ignitions, although being more expensive i guess then adding a tach adapter.

http://www.tachman.com/dixco.htm