I have a 2000 Tahoe LT two wheel drive that has instrument panel problems. The battery light and seat belt light come on, the tach, speedometer and gas gauge drop to zero and then come back up to normal. This happens for just a few seconds. The engine runs smoothly and doesn’t miss. I have replaced the fuel pump, the ignition switch, the brake switch and the whole turn signal assembly. Now the door locks will not unlock when I remove the key from ignition. I have tried to reset the door locks using the owners manual but they still won’t work. Any suggestions on any of these problems??