Hi can someone tell me the correct gas analyser readings to set up the fuel mixture on my
89 xr3i MFI escort?

A garage I am going to is willing to set the mixture and idle for me as it is now out and idling high/too lean or rich since fixing all air leaks on the engine but the mechanic says he doesn't know the exact CO% it should be at running temp.
On the mot test last week it was reading at 1.26% CO with 377HC