Recommend me a pressure gauge and co2 inflator

What’s the digital pressure gauge of choice, something small and compact. Topeak D2?

Also need a Co2 pump for those emergencies when the fatbike tyres dump all their air through a cut/puncture.
One of those that doesn’t use an entire cartridge would be handy for use on the other bikes. Question is will a Co2 have enough volume for a 4″ tyre?
Are we still saying Co2 doesn’t work with sealant?

Edit.. Just found this..

Looks like at least a 20g Co2 cartridge would be needed

Topeak D2 for me.

Easy to use.

Seems pretty consistent.