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Welcome to the Board.
I would check your voltage regulator. The Gas guage is really a volt meter that is measuing off of a known voltage. If the regulator is bad, that known voltage is off and the guage reads wrong.
THe tach is unknown to me.
Good luck
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Scrub
Sisters, Oregon - Home of the Sisters Rodeo.
70 GMC 1,000,000 + miles
72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.
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