Wiring help

[ih]

Hi
Need to replace old honeywell room stat T6360 with DT 90 kindly help
T6360 Terminal 1: Brown
" 3: Yelow/Green
" 2: blue
DT90 is marked ABC ( Mr google says only 2 wires needed is this correct? If so advise
Replying with colour to the terminal will b very helpfull to me thanking in advance
I hope photos get uploaded( retired so photo quality poor) ianmcd response as always most welcome
Regards
Ih

 

[denso13]

Brown to A and yellow/green to B. Sleeve the green/yellow with brown, as it isn't being used as an earth, and terminate the blue safely as it isn't required.

 

[ianmcd]

As @denso13 says , as simple as that