I do have a infra gun and seems a bit off, wich is driving me crazy, and mychron4 2t have different plug in then mychron4 got new sensor on way and will see.
funny thing is on stand idling looks normal goes up to 127f and gun reads very close, but once on track it cools down a lot wich somewhat makes sense since air is going thru radiator but then gun VS sensor is off..