I've been running the "DieselSite" 203* t-stat and billet housing for over a year w/ CAT-EC1 coolant. Outstanding performance from the combo. I just did a run (LaborDay) through AZ. It was 105-110*, needless to say it was a teaspoon of hell. Anyhow, rock solid guage, NO movement from it's normal operating temp. Go for it! The case has been made by this outfit.
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