I have a 97' 25hp mariner 2-stroke and don't know what water pressure PSI range for the motor.... All I found is 0-15 PSI or 0-30 PSI? Anybody know which one? I'm planning to order a electric or hydraulic jackplate when I can. I already have a lenco mini trim tabs and 4 blade double cupped propeller. I have a gheenoe LT15 with 25hp mariner and I ran into alots of shallow mud airboat trails and salt marsh canals I'm worry about my water presssure is not pumping enough water for my 25hp motor, so that's why I need it. Let me know which one.....thanks.