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Old 05-12-2023, 11:59 AM
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Dave M Dave M is offline
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Default 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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Old 05-22-2023, 08:44 AM
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Dave M Dave M is offline
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Could it be that the tach is just bad? Is there any way to test? Or is there a place I can send it to?

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Old 05-22-2023, 11:25 AM
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srmmmm srmmmm is offline
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Originally Posted by Dave M View Post
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
The dyno shop had the same issue with their equipment trying to read the tach signal off the MSD model 8563 billet distributer on my engine. Found out we were 500 RPM low which led to big correction on the calculated power. I even saw the same thing with some a portable meter at a Trans Am series event at COTA last year on a TA series car with MSD ignition boxes. The signal wasn't clean enough to get a steady tach reading.

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Old 05-22-2023, 11:29 AM
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If the tach is reading at all then its likely not bad.

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Old 05-22-2023, 11:32 AM
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It reads low when using the MSD tach adapter. Didn’t work at all without that.


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