First off been awhile since I installed mine… Not sure how durable it is, mine is mounted under the back deck of my boat after my fuel/h20 sensor, so mine doesn’t get real hot at anything I would maybe look at covering it with some styro/foam, see if you can find a 3 inch by 3 inch by 3 inch cube, cut it out to fit around the sensor, between the hot motor and the sensor, I wouldn’t worry about insulating the side not facing the motor myself. I would be a little concerned about the plastic and fatigue if It does end up getting real hot.
Can’t remeber exactly how to set-up tank size.. I think it’s under fuel management or something, I’m actually at work right now, otherwise I’d go check it out on my boat for you, I know my tank size is set correctly on mine.
I was reading through the info that comes with the ep-10 and lowrance suggest you have a nipple on hand in case the ep-10 fails, I don’t have one, never really though about it, I’ll have to stop and pick one up.
If you haven’t got it by the time I get home, I’ll post some more info when I get home for you.