Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 183Get this manual
DIRECT FUEL INJECTION
FUEL INJECTOR INSTALLATION
NOTE: Apply anti-seize grease (obtain locally) or 2-4-C wTeflon to fuel injector attaching screw threads1Insert fuel injector into fuel rail with connector pins facing (inwards) towards center of engine
NOTE: Turn injector back-and-forth slightly to seat injector O-rings in fuel rail while securing injector with retainer and screwsTorque screws to 70 lbin(8.0 Nm)