I purchased the flush adapter for my Nissan NS60 outboard but can’t figure out for sure where to install it. I found a bolt on the left side (from the rear) of the motor that has the word “wash” beside it. Do I remove it to install the flush adapter? Also, a previous owner added a water pressure gauge in the console for my motor. He connected it to the hose that goes to the “pee” hole so it no longer “pees”. Could I connect the water pressure gauge to a fitting in the “wash” hole and reconnect my “pee” line? Any help would be greatly appreciated!