PCM GT-40 owners

General questions for you all as this is the first year (out of 3) that I have had any motor probs and it is getting annoying!
CHeck engine light came on at the end of last year in the middle of a session at the end of a long day of riding. After 3 attempts with a mechanic over winter and a diagnostic tool it ended up being a oil pressure switch. I hear this is common for our motor, have you had to change yours yet?
SO that was a long drawn process but in the end I was happy as had my boat back. Now recently similar "limp Mode" issues have bene happening in the middle of a session, check engine light pops on motor cuts back to 2500 rpms, I let off, get back in neutral, light goes off and I can take off again no probs. I am not stoaked on that by any means but since it goes away I just deal with it. If you have had this prob and have a suggestion for solution please post.
Now on my last run my temp gauge was dead, does not move a mm, have any of you had any of these issues, I only have 120hrs on an 01 GT-40 and feel that i am having alot of small things happen and want to know if anyone else with this motor has some pointers and some proactive ways to keep this motor charging strong as it is the most BADA$$ ride out there!!!