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Old 09-06-2007, 08:29 PM
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Tach reads too high

Any clues as to why a tachometer would read higher than actual rpm? the tach is from a 1984 olds cutlass 305 and is being used on a 1972 chev 350. HEI distributor being used

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Old 09-06-2007, 08:48 PM
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How high is it? Factory tachs notoriously read high. Probably no doubt to save on warranty claims....
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Old 09-06-2007, 09:20 PM
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Most factory GM setups include a tach filter between the HEI and the tachometer, and your '72 probably does not have one. Several places sell them, or you can make your own with a few inexpensive parts.
Run google on "GM Tach filter" and you will find a lot of information.

Bruce
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