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I put the HD fan clutch on and can also hear a difference. Especially in the country away from traffic noises.

These are the stores in your area Mel.

http://www.autozone.com/autozone/storelocator/storeLocatorMain.jsp?targetPage=storeLocatorResults&_requestid=479340

I am doubting the electric fan is the problem if it is on automaticly when A/C is selected. The thing should be running all the time with the A/C on, thus not affected by a temp sensor at all.

Pay attention Bill.

Well the oil being there does not indicate that there is circulation. Oil pressure indicates that the oil pump is in fact pumping oil enough to give it pressure to force it through the oil galleys...

Sometimes the guage connection on the oil pressure guage can be loose or dirty from oil accumulation and though you have a new sender the old connection on the end of the wire is still dirty and oily...

That sounds like a reasonable explanation. I would buy that as your reason.
Did you ever do the ZJ fan clutch like Muddy? That may help to stabilize the temps.

Before sending the boat to Muddy drill a few holes in the bottom so that water from rain can drain out since he wants it dry.