3594 exhaust temp?

[cyclone860]

A new to me 3594. While disking with a 21 foot disc, pyrometer gets to yellow. I dont think Im working the tractor very hard. Water temperature doesnt move very much.
I used to pull same disk with my 1370 with no problems. Where should I start? Gauge,Sending unit, muffler, aspirator.?
Thanks

 

[RGMartin]

Air filter

 

[Dieseltech]

What is the exhaust temp DEGREE reading, yellow means nothing to me.

 

[cyclone860]

Sorry, the gauge is some sort of LCD-bar device same as the other gauges.

 

[J Hamilton]

Do you have access to an infrared temp gun to see what the temp is when the gauge gets in that yellow range? As was mentioned, is the air filter and all intake and turbo piping clean and connections tight? And does the turbo spin free and smooth?

 

[DKase]

When the one on my 2394 got flakey I had to change the thermocouple.