"For some reason it would not work on that tach." Yes as you found out the knobs are not interchangeable. The adj. stems are different for whatever reason. Found that out when I took the cluster apart for your tach bracket. When I boxed up the tach I thought I'd just put a chrome one on but it wouldn't fit. Tried the black one from my car and it fit. Until then I had just thought someone had lost the original and replaced it with something that fit. Then did a search and learned the black ones were correct earlier.
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