02M750Si.e. Tachometer is broken

My needle on my tach broke after just 20 miles. And then at my last trackday it fell off completely and is now just rattling around under the plastic.

Do I have to run that speedometer/tachometer unit, since i dont use it on the track.
I am not positive but I think the bike won't start without it, because When I put on that new tach, i had to reprogram my keys.

Can I take apart the tach housing without damaging anyting? do i just remove those screws in the back?

Anyone else have tach breaking problems, because this is my second one to break, the first one broke under warranty so they replaced it for free, but the one they gave me broke after just 20 miles, so I was figuring it is a common problem