I know this must have been answered here in the forum before, but darned if I can find it.

Anyway, I just had a new set of tires mounted on a new set of rims. I totally forgot about the TPMS sensors. There's no way I'm going to get a set of these before setting of for the spring Dragon on Thursday.

So my question is:
Do I really need these TPMS sensors? Is the only consequence to not having them an idiot light on the dash?