Silverado-moose

Excuse me if these questions have already been asked, I have a 2014 Silverado 1500 gas with DL8 mirrors and want to uprgrade to aftermarket towing mirrors with the clearance light/turn, power adjust, and heated, manual fold. Do i need to make sure the mirrors have a ambient air temp sensor in them or not?, i know i will need the DIY harness from Pgamboa but will i need anything else, I planned on being cheap and getting mirrors from ebay just because i dont have a whole lot to spend on this upgrade, thanks for any info