I have noted several post of photos where people have added a Temp Gauge to the Kubota L2350. They are doing this by removing a PLUG that is on the head and putting a sending unit in place of the plug. Simple two wire +- gauge. In all the Post they say they got the unit from tractor smart or Kubota but no one posted which unit they used part # etc. Want to make sure I order the right one to fit the plug hole. Anyone know what one is the right one please let me. Thnaks