Part numbers:
RB-Tam-27 Tamiya Tracked Chassis kit
RB-Tam-32 Tamiya 4 Speed Double Gearbox
RB-Pol-16 Pololu Low Voltage Dual Serial Motor Controller
I am still working with these along with my Arduino UNO microcontroller. But I have put this project aside for the time being as I was having difficulty maintaining battery life. I also had some problems getting the motors to make left and right turns reliably. So if anyone else has worked with these items I would appreciate some advice.