There are 2 DB25 connectors on EIS4000. One has all cht egt from engine. The other all other connection. pin 25 is the 4.5 volts used by various things, you for fuel pressure. Grab voltage there for fuel pressure + terminal, BUT PUT PROPER Resistor in line eg. Pin25-wire-diod-wire -terminal of fuel press sender. Good luckFuel pressure is all over the place. Where does the diode go to fix this problem? Carburetor 0-360
There are 2 DB25 connectors on EIS4000. One has all cht egt from engine. The other all other connection. pin 25 is the 4.5 volts used by various things, you for fuel pressure. Grab voltage there for fuel pressure + terminal, BUT PUT PROPER Resistor in line eg. Pin25-wire-diod-wire -terminal of fuel press sender. Good luck