Buy yourself a Techtom (you can probably get an early used version for about $100). That will give you accurate values for water temp. I had the same symptoms as yours' for oil pressure....like 0 psi sometimes. I replaced it and saw that my pressure was about 30 psi warm at idle, and 70 or so psi at cruising (They are $60 new). Don't start chasing problems until you determine if you actually have any. Good luck, Mark