Only Gauge: How Change AFR to Lambda without Software

[tds.lurker]

Hi @ all,

I'm usinge the VEMS Gauge only to display the EGT and O2. I'm using no software or such things.
After working on my engine i turn on my ignition and the Display show no more lambda- it switched to AFR.
So how i can switch back to Lambda mode? i press the button, nut only the slots are changing.
sorry for this stupid question...

Thx
Timur