Ignore it? I've put a piece of tape over mine and just carry a $1 gauge to check air pressure like we always did.
If you truly want to fix it, you have to make sure each wheel has its TPMS sensor in it with a good battery. Then you need to fork over $100 to a shop to reprogram it. If you don't have the sensors, you need them to pull the tires off the wheel, add the $50 sensor to each wheel, re-mount the tires,re-balance everything and reprogram. Probably $500 total?
Piece 'o tape and a Wally World air gauge is sounding mighty nice.