I do not have a WC gauge, not familiar with the acronym N. am or EC. The regulator that was on the truck originally is long gone before my time. In addition, this truck was a mess. The ECU was bad, the temp sensor was missing, the FCSV was cracked, the check ball and elbow were missing, the MIL bulb was removed, the plugs were incorrect and the wire set was junk. In addition, the thermostat that is supposed be on the LP regulator is long gone. So needless to say I am up to my ears in parts on this thing and I still have a coding truck. The only good news is that it really runs good