So I purchased a 2003 mini Cooper S in Memphis yesterday. And drove it the 2 1/2 hours back to Arkansas and everything was working fine except for once when I pulled into a gas station and the temp gauge went up to a quarter of the way to overheating but then back down I got home and everything was fine. Until I started the car again a few minutes later and I had a tire pressure light a traction control light and the check engine light. And the temp gauge was being extremely sporadic going from all the way to overheating and lighting up back down to normal and going back-and-forth rapidly. I changed the coolant out today. And it was nothing but rusty mud water. Which is quite discerning. But I’m glad I changed it. But all of my problem still persists after that. My tachometer will also sometimes drop to zero even when the car is still just idling fine. When it does that the check engine light will turn off but the ABS light turns on and then it will go back-and-forth between those along with raising the tack back to idle. I am unsure what is happening here. But I believe it could possibly Be some thing electrical. Which I am extremely concerned and bummed about as I have posted here many times before because I have another mini Cooper 2002 that has more electrical problems than you can shake a stick at. And I don’t know what to do about it

 

I guarantee you that not all those things are going wrong at once! Since you drove it 100+ miles, there can't be much wrong.
I'd start by getting the battery load-checked & clean all the grounds. After that, start on any electrical plugs you can get at with a switch cleaner.
MINIs are famous for water leaks onto the computers. Alternators fail with regularity & MINIs need voltage.
& then see what you've got...

 

i drove it to work today and almost all the way there the tire pressure light and traction control light were off but the check engine light stayed on I'm going to go get my electrical testing tools after work and do some searching and diagnosing. my front charger port doesn't get any power either not sure if i mentioned that earlier or not