This truck came with a mechanical fuel pump. Previous owner placed an external electric fuel pump. This one pumps continuously from the time the key is turned to the on position. Gas is now in oil. Does anyone know what PSI & type of external electric fuel pump to use and how to wire it so that it only pumps when the motor is running? Also, my fuel Guage is not working. Any ideas about how to get the Guage working again? Thx in advance!!