Did you chang coolant temp sender or sensor, I think they had both that year, Di you change the one for the gauge instead of the computer.
-2001 Tahoe original 5.3 4x4 only 430k
-A Metric Butt ton of three wheelers
-1985 V65 Magna
-1983 Nighthawk 650
-1969 F250 Highboy built 360