EGT CHT readings false on #1 cylinder

[Remy]

Hello All,
Before starting, all EGT are reading OAT, but after starting, #1 cylinder shows red cross on CHT and a false reading on EGT, very lower than the others
Checked connections, ane discrepancy is still here
Any idea?

 

[SkippyDiesel]

Check that the thermocouple/sensor is working correctly - swap EGT and see of the problem moves or stays

 

[RVDan]

the EGT thermocouples can fail like this. I would swap thermocouples and see if the problem follows.