OK so I have a 02 chevy Silverado 2500 I have had multiple issues. I currently have a fuel pressure drop issues. Fuel pump , fuel pressure regulator , fuel filter is all new and sill over 4-5 hours it drops pressure. Then I have a a battery issue. New battery and alternator and I have been jumping my battery every day after my truck sits over night .but my truck has 285000 miles on it . The gauge cluster has issues I have one gauge that is erratic and that is the oil pressure gauge then I have no back lighting so I replaced the bulbs with blue leds and they come on for about 15 minutes then they go out . And tip would be appreciated I don't trust dealership or shops so I do most of my mechanic work but just can't figure this out