Recently, I purchased a scag, with a liquid cooled 27 h.p. kaw. engine. I have had turf tigers in the past,all were air cooled Kohlers. I can't seem to get the temp gauge to register anything. Engine is full of coolant, new sender, gauge will peg to full right when leed is grounded. A temp gauge put into the radiator neck after the mower has been running w/ deck engaged for 10 minutes reads 150 to 160 and seems to cycle. I don't know alot about these engines, any help would be appreciated. This is a hobby/business I have loved for many years, just don't much about these engines.