Our temp gauge has been reading 140. (2002 Air Nautique with the GT-40) We thought that was strange as it should have had a 160 degree thermostat. So we ordered a 160 degree thermostat and just put it in. When we tested it it only warmed up to 140! :shock: So we tested the hot water temp coming out of the shower (just installed) and it was 158... Any idea why the temp gauge is only reading 140?