1995 Mercruiser 350 Tournament Ski Direct Drive in a 1995 Ski Sanger DLX 20 tournament tow boat. Anybody have a rough idea of the top temp under the engine cover? (I don't have any automotive/scientific measuring devices. Maybe I could use my instant-read meat thermometer?) Not talking about engine operating temp, but the space around the engine and bilge. I want to install a fuel shut off in the fuel line that runs on the starboard side of the boat, and I want to make sure the valve I install will operate safely in the temp in there. Please don't overthink this. I have a reason to do this and want to do it safely. If you can't come up with a number, that's OK. If you can reference a part you think is right for the job, even better. Knowledge helps, not opinion. Let's not get into a 40-post discussion. Many thanks for your help.