05-12-2023, 11:59 AM

Dave M

Senior Chief

Join Date: Dec 2007

Location: Dover, FL Formerly from Willington, CT

Posts: 349

71 Formula Stock Tach not working with MSD Grid

We've been trying to get my tach working with an MSD Grid. Without MSD Tach adapter, it doesn't work at all. With the Tach adapter, it reads way low. Like about 5 or 600 rpms when it's really at 1000. And it becomes off by more as the rpms go up. Anyone ever run into this? I'm trying to retain the factory tach for a stock look. Thanks

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