Brand new first time atv owner here with a newly purchased 2002 polaris xpedition. Thanks in advance for your help.

I've seen a lot of posts about the 4 wheel drive / speedometer problems with xpeditions. Just curious, I saw a mention of a trail Tech in one of the threads... If I would Just add an aftermarket speedometer on would 4 wheel drive work again? I don't really care how it works I just want everything to work.