Mercruiser Fuel Pressure Diagnostics

We’ve been having running issues with our 2006 341 Meridian’s Mercruiser 6.2 motors.  Our port motor won’t go over 4000rpm.  Follow along as we diagnose the problem by first checking the fuel pressure on the two motors using a fuel pressure gauge and comparing the readings to hopefully troubleshoot our problem and fix the issue of low rpm on one engine.
Product links:
Fuel pressure gauge:  https://amzn.to/3VpLq5C