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Many tachometers have a 4cyl/6cyl/8cyl switch. Sounds like yours is still on 4cyl, check it. As for the voltmeter, where is it connected to? You may have either a poor connection or you may actually have a charging system problem which is what the voltmeter is supposed to do, tell you when your system voltage is low or high.
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Dan
'77 Cutlass Supreme
'46 2 door
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