Yamaha - Oil Pressure Switch Engine Monitoring Component YA9-42995-13-00. Overview. Oil pressure is one of those things you don't want to guess about-it either works or it costs you an engine. I've seen motors saved just because the warning system caught low pressure early. The Yamaha Oil Pressure Switch YA9-42995-13-00 plays a key role in that, sending accurate signals so you know what's going on inside the engine. It's a small part, but it gives you peace of mind every time you turn the key.. Key Features. • Accurate Pressure Monitoring - Detects oil pressure levels and triggers alerts when needed.. • Yamaha Factory Calibration - Built to match Yamaha engine specifications for reliable readings.. • Durable Sensor Construction - Designed to handle heat, vibration, and engine conditions.. • Protects Engine Health - Helps prevent damage by warning of low oil pressure conditions.. • Direct Fit Replacement - Installs easily with proper connection to the engine system.. Engine & Boat Compa