Help with MSD and tach
 

I am goint to light my sc tonight. I have put in a stock 3.2 with webers and ssi's. All I have left to do is fill the carbs with fuel, and turn the key ( I am excited, as I havnt driven this car in about 3 years) The 3.2 is a tempory install while I redo the 3.0 Any how, I have the MSD all wired up, and the tach doesnt work. I have the tach adapter, and I had this same setup on another mid year, and it worked fine, any one have any ideas, or want to share some info on how they wired up their MSD. Oh , I am using a 2.7 Bosch distributor to trigger the msd. a little old shcool I know, but it works. Thanks for your help

I had to send my tach to Sacramento Speedometer and have them rebuild it with the correct internals and such to work with the MSD before I could get it to work. I tried lots of other options and ideas, including inquiring with MSD tech support on what I was doing wrong. Nothing worked.... until taking the above action.

I hope you have better luck. ITs been 5+ years but the tach rebuild costs like
$175 then if I remember correctly.

I have an MSD on my SC without the tach adapter and my tach works. When I first hooked up the MSD the tach wouldn't work. It turned out the tach signal terminal on the MSD control wasn't connected internally. Once that was corrected the tach worked.

you may have a bad combination with the 2.7 dizzy and an 80 tach. on my 77 2.7, the stock system uses ground as the signal to the CD and the tach, so mine worked without any mods. if your tach does not use ground, it will not work with the earlier dizzy.

I have the same setup as you do in a 77 2.7 with webers and ssi's My tach works fine without any adapter. I bought one anyway when I ordered my MSD 6AL. The tach works fine with or without the adapter. Just wire it up as the booklet says and you'll be fine.

I had to run a wire from the MSD straight to the tach to get mine to work. I don't know if there was something wrong with my wiring harness or not, but plugging straight from tach to MSD worked for me.

I just did this on my '82 and it worked fine to connect the tach output of the MSD directly into the 6-pin connector for the CDI. No issues.