I completed the conversion but I am running into a problem with the oil pressure sensor. I've got a 1980 Malibu running a 94 350 enging and my wiring to the firewall to the current oil pressure switch/sender has two leads. The switch I have in there now has two leads and the oil/choke light worked. I swapped wires in the harness per the diagram to go from sweep to round with gauges. I bought an oil pressure switch at the parts store for an 85 Monte SS and it has only one terminal on the end and is enormous compared to the other one I made sure to get the switch for gauges versus dummy lights. The new switch is so much larger that it will not thread in to the hole behind the distributor without pulling the distributor. Do I have the wrong pressure switch/sending unit? Anyone else had this problem? Photo posted current switch is on the left and new one is on the right. It's been bugging me that the oil pressure gauge doesn't work.