Reconfiguring / swapping T0 for T2

Hello,
I am running Mendel Max 1.5 using updated Marlin firmware, Arduino Mega and RAMPS 1.4.

I'm not getting any temperature feedback from my hotend. It starts to heat-up, but since there is no feedback, it times out after about 20 seconds,then shuts off. (Message in Ponterface reads Error: Printer halted.kill called)
The heated bed works fine.
Both thermistors have been tested and are working correctly

I want to connect the hotend thermistor into T2 instead of T0 on the Ardunio board.
Does anyone know how to modify the firmware to do this?

Attached is a copy of my PINS.h code

Thanks
Montreal