Hey gang..
Finally resolved the MSD-6A non-firing issue I had on my buddy's '71 v-code 440 Challenger R/T. We'd like to get his factory tach to work as well and I see there are numerous adaptors for this that MSD sells. I'd like to get suggestions and ideas from you E-body owners who have already gone down this road. I have the box mounted under the battery tray and if I'm not mistaken, there's a "tach" port on the side. Right now the OEM tach lead isn't attached to the - side of the coil, didn't want it to mess around with the electrical system when we 1st fire it up.

Any suggestions on working configurations you all may have?

Thanks in advance..
Troy