OMC Oil Pressure Sender - 18-5899 OMC Oil Pressure Sender - 18-5899 by Sierra. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. $ 28.50               More Information      Quantity:     Mercruiser Oil Pressure Sender - 18-5899 Mercruiser Oil Pressure Sender - 18-5899 by Sierra. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. $ 28.50               More Information      Quantity:     Oil Pressure Sender - 18-5899 Oil Pressure Sender - 18-5899. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. All prices are per unit (50' Coil=50 Units, 2 PK=2 Units, and etc.). Verify your quantity is correct at Check-Outnd adjust as necessary. Send us an email (Contact Us button at top of any page) if you have any questions. $ 28.50               More Information      Quantity:     Mercruiser Oil Pressure Sending Unit - Replaces PN 815425T Mercruiser Oil Pressure Sending Unit - Replaces PN 815425T. For use with 80 psi electric gauge. Fits most Mercruiser applications. 18-5899 $ 28.50               More Information      Quantity: