hey guys, I just bought a 1990 3500 with a 454 that the previous owner messed up...so i put in a 1988 454 that we had lying around and the thing runs great except all the gauges are a little screwy...except the fuel and speedo. the alternator gauge reads that it is putting out 19 volts but i got it tested and it is only putting out 14....water temp gauge starts fine and slowly increases but red lines. We put in a new water pump and thermostat, and the new fan clutch doesnt lock up even with the gauge saying it is boiling over....the oil pressure gauge goes right to the top right from start up and stays there then will drop to about half then bounce all over the place....i have no clue where to start looking, any help would be appreciated