These pictures may help. I spoke with the Yamaha customer service, they're not allowed to tell me exactly what to do but the guy was as helpful as possible. He did say I needed a water pressure adapter part number MAR-WPRES-AD-TR. He wasn't allowed to tell me where to install it but hinted it may be one of two places. The adapter did not fit the bottom port with the red arrow but did fit the upper port at the yellow arrow. I removed the yellow arrow bolt/plug and after running the motor for a couple of minutes there was a small amount of water and air coming from the opening, I would think there would be a steady stream of water, he did hint that there should be some water coming out of the correct place. I would like to confirm and not guess that the upper port is the right place to install the adapter. There seems to be no other use or purpose for either bolt/port. After thinking about this issue I looked at the small section of water tubing that is very accessible and was wondering why I couldn't install a T connector in line and tap off a line to the gauge. Anybody have any experience doing this?
