2002 HR DP with Cummins ISP 275- Oil Temp Gauge

I purchased a ScanGaugeD recently. I copied all of the info for the extra X gauges and sent them in to find out that there is no transmission temp readout.

Has anyone here installed a trans temp gauge? Is it very difficult to install the sensor? I m guessing that would be the most difficult part of the install.

Tusen Takk!