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Pinged you.

Here also:
Sender: Sierra International #TS26611
Gauge:  SeaStar Solutions Eclipse Series Water Temperature Gauge. #68401P

Actually not sure what # is stamped on the sender.  I'll check that this weekend.

So this is a new boat to us, 1987 Cat 30 (universal M25XP) this year.  I did some upgrades this winter before we splashed her and although everything is working great the temp gauge is not.  Here's where I'm at.  The temp readings were seriously erratic before I started "fixing" it.  I won't go into all the details but the gauge finally had a good laugh and the needle just dropped off. So that explained a lot.  Sigh.  So at this point I have a new sender in (with a grounding strap), new thermostat (checked that it was stamped for 160), and new gauge.  Now when I've got the engine warmed up the gauges reads about 182ish.  I also picked up a laser infared gun from HF to check from the outside.  It reads 154, pretty much everywhere, tstat cap, top of engine where the coolant is filled.  The gauge has been tested and responds full on when grounded. Sender is the right ohm range for the gauge (Seastar Solutions Eclipse).  The only thing I've not really tested is the ohms at the sender.  Does anyone have the readings I should look for?  And does anyone have any other ideas what could be going on?

Could it be that the IR laser is not accurate and the temp really is in the low 180's, but that leads me back to the tstat is stamped for 160.  Tstat had a green strip on one of the frames that points up, is that supposed to have a specific orientation? Boat lives in salt water in NY.

Thanks