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All the 4cylinder tachs are calibrated the same, and they should all go up to 7000rpm. The only difference is that the ones originally meant for the B23 and B230 engines have the redline marked at 6000rpm due to the rev limiter cutout at around 6K. A tach originally meant for a B21 has the redline marked at 6500 because there was no rev limiter w/K-jet and I guess they knew those engines could handle higher revving and provide fuel for higher revving. Any of the 4cyl. tachs will work with any of those 4cyl. engines. However, a tach installed in a 260 with a 6cyl. engine will NOT read correctly if installed with a 4cyl engine.
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