none of the machines are manufactured ANY different. every single machine has the same exact requirements. i build (1) kit, and it works on EVERY machine. commander, maverick, maverick max, 2011, 2012, 2013, 2014. the switchless kit he is building is a great idea, believe me i thought of it a long time ago, but it is succeptible to the voltage changes of the machine way too easily. some machines have a high voltage problem, some machines will produce 13.6volts at idle and some will only produce 12.6 volts at idle. when you are manipulating a signal to make the ECU see a certain voltage signal, and your beginning voltage varies so much, your end voltage will also vary. the switchless is a good idea, but looking at the posts on here and the commander forum popping up literally daily, i would be willing to bet the switchless kit he is selling, has about a 60% failure rate. get the kit with a switch. if you dont like the switch just wire tie it up behind the dash and leave it on. you wont have the switch in the dash, and it will still work like the switchless.
i have had machines with his kit on them come thru the shop. and i see things like when you cut the lights on the dash blinks back and forth and throws E codes. of when you hit the brakes it will throw an E code. this is all because of the voltage draw on the system. when you cut lights on, it drops the voltage of the entire machine. when you take the voltage that the switchless is sending the signal down the line, and rob voltage from it as well, the computer gets confused and throws an E code. the switchless problem is how it gets its signal, and how it manipulates the voltage down the line. it is way more succeptible to the beginning voltage of the machine and since some machines voltage is so far apart from the beginning, it makes the harness not work.