did you use the old sending unit from the old motor? These fail and the time and give low readings, just replaced mine on a 92 convertible, it was doing the same thing, go to pep boys and get one, while you are replacing it ,screw a manual guage in first to get an accurate reading, I have heard of many early 347 kits in need of a rebuild before 50k........
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86 GT, March Pulleys, Off Road H-Pipe, Ultraflow/Mac Tailpipes, 3.73 gears/ AOD to T-5 Conversion/ Motorsport Wires/ Trick Flow Heads
BBK headers/ F Cam/ Forged TRWS/ Cobra Intake
Mass Air conversion, Bored .40 /1.6 Motorsport
rockers
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