As far as voltage, that scangauge reports it, I always assumed it was like the other info, that it was displaying the ECU info. Surprised the Ultragauge doesn't do that, probably the only thing I would miss from my SCII.
To check if it reports readiness, I think you could check codes, then clear them, and check them again, to see if it displays anything, like "ready", "not ready" etc..
To check if it reports readiness, I think you could check codes, then clear them, and check them again, to see if it displays anything, like "ready", "not ready" etc..