I have a brand new boat with a Mercury 250HP 4S ProXS (S/N: 2B637141) and a Level 2 MerMonitor installed. The MercMonitor shows 0.0PSI for water pressure. Regardless of what screen I am on it always reads 0. All my other engine data is showing up correctly. Also there are no alarms on the MercMonitor. My analog gauge is showing water pressure just fine. Any ideas why my Level2 MM will not read water pressure?