Thread: MERC oil light on problem

Tom, look at this diagram. #28 is listed as a switch and I’m pretty sure it’s oil pressure switch. Figure it may just be stuck from sitting. Might put something against it and tap it lightly and get it to unstick or just replace it. If not that then next would be something in computer box but I’d go to that switch first.
Mercury Outboard Parts by Year (Mercury, Mariner, Mark, Force, Chrysler, Sears, SportJet) Mercury Outboard OEM Parts Diagram for Flywheel & Ignition Coil | Boats.net

Cray, you a wizard! A gentle tap did it. This engine has low hours. Should the sensor be replaced? This boat isn't used much.

check this link and look at the tohatsu and compare to merc sender. Looks the same to me. merc price is about double. I believe tohatsu builds the merc in this hp range.

Boats.net Search: 2008 Mercury 20m Oil Pressure Switch

Originally Posted by Cane Pole

check this link and look at the tohatsu and compare to merc sender. Looks the same to me. merc price is about double. I believe tohatsu builds the merc in this hp range.

Boats.net Search: 2008 Mercury 20m Oil Pressure Switch

Hey just glad it worked. I wouldn’t worry about it unless it keeps doing it.. yes they are same part. Your power head was most likely built by Tohatsu. They built a awful lot of 40 and below for Merc powerheads and May still build them. Only difference I know between the 2 motors is on some electronics are a little different and on some only thing different is outer skin.