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hello, i usually figure my problems out myself. on my 85 f-150 having trouble with fuel gauge/temp. i checked all wires for current. thumbs up. i went anyway and replaced pump/sending unit. checked gauge with test light behind the dash. 1 sides a low pulsing light the other is brite pulsing. thought it may be grounded out. replaced the cluster ribbon, still having the same reading. how do i fix this problem anyone know?