Donny,
Your tach should work fine. With earlier '69 - '70/'71 tachs that used a ballast unit ... the issue is the weaker signal level on the TD lead ... some tachs work, some don't.
Try yours, and maybe you won't have to change it out.
__________________
Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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