Just installed one on my 50 on my Weld-Craft last week. Helps determine when it's time for a impeller service as hours pile up and indicated temperature increases.Cheap insurance. Around $30 shipping included. https://www.oempartsllc.com/gaugeom...rbrktwire2gaugewblackmattefinishbezelnew.aspx Great bargains on marine push-pull switches and courtesy lights to. Randy the owner is very professional, quick shipping, E-Mail order confirmation and tracking info. He only has 10 left so jump if your interested.