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Discussion in 'Troubleshooting & Diagnosis' started by joer, Dec 26, 2020.
How can I get my factory tach to work off my msd box. 79 Z/28 need help.
Is your 6AL an Analog or Digital version ? ... and did you RTFM (Read The Manual) ?
here're instructions for Analog.
http://www.g3ignition.com/images/MSD 6 Series Installation Instructions.pdf
It's an old msd-6420 box. I always ran a after market tach. The tach started to jump around. Could be the tach so i changed it. New tach still doing it. I called MSD. Might be the tach plug on the box. What i want is to not use after market any more. Why not use factory tach. What i want to know is how to connect factory tach to msd box. Using sum-850050 distributor.
There is a filter for those .If not in your manual contact MSD
I talked to MSD. He said something about cutting out filter. After you cut out filter can you splice a wire from the end to MSD box?
My MSD 6AL is a model 6420 cause I didn’t want to go digital and my brown Tach wire works on the Tach connector at the MSD box.
Just what he said
that's what it says in the instructions I linked above; mid-way down page 7. "Bypass In-Line Filter"
JMO, for a motor that's primarily street ... a good, stand-alone HEI dist is hard to beat. Hot fire & dang-near bulletproof & parts readily available. Have run HEI in CT race cars. I've also run CD boxes in CT race cars; still have spares (suggest you travel with spares as well). Ya know, before Cup went EFI, they all ran a dual-trigger dist and TWO coils & TWO CD boxes; all redundant with selectable A-B switchgear. Always brand new stuff but boxes still puke.
My set up is the same as COPO. Old 6al 6420. I'll look for the brown wire and change the end. Plug it in and see what happens.