If you don’t take AZ and NV with you, you will get your Colorado River water cut off and lose a lot of farming power. That might even require UT. Unless it’s only Northern California included, in which case you still lose that agriculture, and possible land based trade lines to Mexico. It’s not a clean and pretty separation.

Download the Phyphox app to access your phones raw sensor data. Very much like a tricorder.

Check out the app Phyphox, it uses all your existing sensors and probably surpasses tricorders in several ways while, of course, lacking in a few others.