Help gauge problem and cannot connect to dlc
 

hey i have a 99 trans am i had wrecked it and am almost finished re building it the car has been running no problems for months now then suddenly one day i park it then the next afternoon after work the car will start up run ok at idle then the fuel gauge cuts out and the coolant temp gauge and the tach and i cannot connect my laptop to it ive tested wires and fuses and grounds i replaced the the pcm pcm was programmed for some reason theres no signal from the dark green wire pin 58 on the blue connector and im not sure what controls that circut and everything . but still the same problem im stumped and its very frustrating dose anyone have any ideas please? thanks

Check the cigarette lighter fuse, it also effects the obd2 port power.