1999 330 ec oil pressure gauge

[dannyfranco]

port side oil pressure gauge was replaced a few years back work great reads 40psi at cruise speed starboard has never been changed at cruising speed reads around 20psi motors run great any chance its the gauge

 

[fc3]

Could be. Switch the port and starboard wires and see if the problem follows the gauge.

Or, use an ohm meter and read the resistance on the sender.

PSI	Ohms
0	227 - 257
20	142 - 163
40	92 - 114
80	9 - 49