When I rode dirt bikes I used a compressor which plugged into the car. I did have a floor pump as a back up. Never had any problem with the compressor. I did always use a separate low-pressure gauge because I ran 9 psi in the front.

I use floor pump for the bikes but also use a low-pressure gauge for the mtb. I run 15 psi in the front and I don't know how accurate the pump gauge is at the low end. I would think the digital gauge on the new compressors would be pretty good.