hi chaps newbie to forum here 79 year old male retired builder living close to the beach at mt maunganui nz long time petrolhead currently have 2006 c200 coupe 2008 cooper S 1998 porsche 986 but im here primaraly for info installed aftermarket water temp gauge in cooper s but im getting readings on the gauge about 30degrees c above what my infrared thermometer says on the hoses and sender housing what have i done wrong ?? cheers gary