Factory RPM dead after MSD 6AL installation.

[philcollins]

I’ve installed an MSD 6AL on my 1972 Satellite with factory in dash rpm and factory electronic ignition. Wired as per MSD instructions, engine run fine but the RPM doesn’t work anymore. I then installed MSD 8920 tach adapter, still no tach. Double checked all the connection, can’t find the problem?
Any suggestion?

P.S. runnning stock recurved Mopar electronic ignition with MSD HVC 11 coil.

 

[dadsbee]

Did you leave tach wire on the coil or move it to the MSD output?

 

[philcollins]

MSD output, gray wire.

 

[kiwigtx]

Is your Tach Adaptor wired correctly?

 

[philcollins]

Yes it is. Btw, only 4 wires to connect. Switch 22 volts, ground, white goes to gray on MSD 6AL and violet to tach sending.