I recently went through this issue with two vehicles. Discount Tire tested the sensors and recommended replacing the one that shown defective. It was $66.00. About 1 month later I got another TPMS light on my dash. Discount Tire tested and found another sensor bad. At the age of the tires and mileage I had them replace all for tires and replaced the other 3 sensors. The sensors were $140 total for all 3.
I have noticed that when the ambient temperature drops low, the tire pressure drops and I see a light on my dash when I start the car. After about 5 miles down the freeway the TPMS light goes off.
I have pumped up all the tires to max cold, but I don't like it because the car rides rough and generates more road noise.
There's only one digital tire pressure gauge I use... ETENWOLF
https://a.co/d/7OwTlSs