I recently bought an older boat, Thompson 18' with a Mercury 900 O/B (@1978, 2-stroke, 90HP, 6 cyl.). Everything runs fine. I bought a manual for the engine and saw that you can buy an inline oil pump/injector that hooks in the line between the fuel tank and the engine - not hooked to the engine directly. Does anyone know about these? Are they worth it? Anything to be worried about?<br /><br />Also, any hints/tips about this engine I should know about?<br /><br />Thanks!!<br />Dave