Re: Best RPM Range Tach?
The vacuum gauge used in 67-72 trucks was really useless because it's purpose was intended for larger series trucks with the Hydrovac unit. I put a clock from an 81-87 C/K series truck in that location on my 68. The GMC 68 owner's manual actually listed an optional Bat-O-Meter for that as well, again it was one of those things that never caught on because nobody really knew about it.
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