My boat has them but neither work? I think somoen unpluged them or something.

where do i need to look? whty would they both not work? Boat is stock

check on the back of the block under the head on the port side of engine.

There is a pipe thread port that also provides a feed for the 3 wire digital oil pressure sender. they usually do a double feed off of a small brass manifold. one side is pressure. the singe wire feed is temp.

It's just aft of the oil cooler and right behind the raw water hose

Stock Merc 496's do not come with oil temperature gauge sensors. You may have gauges, but if no sensors have been installed in the engines and connected via wire to the helm then you will have no oil temp guage readouts until sensors are connected to your guages. These would not be Mercury sensors but aftermarket provied by the gauge manufacturer, possibly, Livorsi, Gaffrig, Faria, Stewart Warner, etc. Its pretty coomon for boat builders to install extra gauges and not install the sensors or wiring or connect them.

Best Regards,
Ray @ Raylar

Seams like a waste of money. Any one want to buy a set of yellow oil temps? Haha redoing my dash anyway for gps not going to put back in gauges that don't work!

I use a cheap infrared heat gun to periodically check oil temp. Just aim it at the oil pan. I also make sure the oil filter isn't sizzling whenever I'm looking things over.

A sizzling oil filter is bad..... That's all I am gonna say.......

teambajamarine.com talked about this baja installed the oil temp sender in the wrong place,,,its will always read 140degrees,,,
your gage probably works ,,,the sender is in the wrong place

ok i have the same issue they both stay on 140deg i have twin 496ho so is there a place to move them to?

Sometimes boat manufacturers put oil temperature guages in dash from order or frill space reasons. If they are not hooked to properly located oil temperature sending units on the engines they will not read at all or properly. Mercruiser 496 engines do not come strock with any oil temperature provisions so if the rigger for the boat wants to use those guages they must be hooked up to aftermarket oil temperature sending units on the engine.

Best Regards,
Ray @ Raylar

I know this is an old thread, but I have the same problem on my 2004 baja 30 outlaw with 496 mags. The current location of my senders are on the backside of the block behind the intake manifold above the flange the bell housing bolts on to. I'm assuming this is not a good location? Where should the sender be located?