VEMS Gauge - EGT probe calibration?

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Hi,
I have VEMS WB controler and with it, I got a 2mm EGT probe. On idle, had 220-250 deg. celsius readings and on WOT (full boost) I got readings no more than 750-800 deg. celsius, which seems fine to me. However, my car is Volvo S40 T4 and has turbo charger. According to VEMS, a 6mm EGT probe is much safer for turbo applications, so I bought one. After swapping probes, I'm having funny readings, idle about 500 deg. celsious and WOT over 1000 deg. celsius :o. Do i need EGT probe calibration and how to do it?

Thanks,

Tomislav

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The probes themselves are k-type which mean that they give a specific voltage output for a specific temperature regardless of the size.

Normally I calibrate the sensor with ice and boiling water using the settings->EGT Input values.  Set the offset to zero and the calibration to 64. Adjust the calibration until you get a 100degree difference between the ice and boiling water - then use the offset to set the temperature so that it reads 0 in ice, and check the boiling water temperature to ensure that the temps are scaling properly.

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I got it :), many thanks!!!