I bought these recently and thought I'd share what I thought.

https://www.amazon.com/dp/B09Y1QM2P5?ref_=pe_386300_442618370_TE_sc_as_ri_0

It's a tire pressure monitor and it talks to your phone about pressure and temperature.  Easy to install phone app.  You can set limits and it'll warn about under/over pressure.

Had it about a month, I'll update after awhile to see how long they last.

I don't use a phone mount on my bike very often, so I got one with a separate display.  I've used this one for 2.5 years on the Rocket.
https://www.amazon.com/SYKIK-Wireless-Pressure-Monitoring-Motorcycles/dp/B07B...