The tachs need to be calibrated for either the 6 or the 8 cyl.
Internally there is a capacitor that changes value depending on the # of cylinders. It's an easy change for someone who knows some electronics and can solder.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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