Yamaha - Oil Pressure Sender Engine Monitoring 6AW-83651-00-00. Overview. When you're out on the water, knowing your engine's oil pressure isn't optional-it's everything. This Yamaha oil pressure sender is what feeds that critical data back to your gauges, helping you catch problems before they turn into real damage. It's the kind of part you don't think about until it fails, but when it does, you feel it fast. Built to handle the vibration, heat, and moisture of marine use, this sender keeps yo