1970 Challenger ralley instrument and MSD digital 7 plus

[383magnum]

Hi folks, yesterday I was trying to connect the old rev meter to the rpm wire from the msd digital 7 with no respons on the meter?? it works on the new rpm meter that I want to remove.

 

[moparleo]

Welcome to the site.

 

[383magnum]

Thanks..

 

[383magnum]

Hmmm....it will only work using the original ignition, so tomorrov i will pull All the msd stuff, and plug the sensors on the headers.....Hope it will work.

 

[383magnum]

Worked alle Day on challenger, all the msd stuff is out, the old is back, and rpm meter works again, engine runs like ****, Think som of the 750hp is lost, but I like it original so

 

[Chryco Psycho]

You need a MSD tach adapter to work with the fctory tach