Quick view Add to Cart Mercury - Mercruiser 79-8M0069415 Gear Oil P. Gauge $124.99 $109.99 Mercury - Mercruiser 79-8M0069415 Gear Oil Pressure Gauge Genuine OEM Mercury-Mercruiser part. Dual scale (English and Metric) 60 psi oil pressure gauge. White face Glass lens Fits standard... Add to Cart