I have a 1985 4runner. I swapped out the regular gauge for the rpm type. The rpm type came from a 1985 2wd. pickup. I switched the oil sending unit and started the truck up. The oil pressure gauge does not work. The fuel level is showing past full when I only have a 1/2 tank. The temp. gauge slowly goes up to the red after idling for about 3 minutes. The only thing that is working is the voltage gauge. Any ideas would be great Thanks