Picked up two liquid filled gauges from a local auto shop (0-300 psi and 0-600 psi) that had 1/4" NPT fittings. Got some adapters and quick-disconnects and now I have a great little set that is quite accurate. Still looking for a similar 0-1000 or 0-1200 psi gauge to finish it off for HP or tank setups.
I use pretty high flowing regulators and I don't have fast electros so I am not worried about recharge rate. The accurate of the liquid filled is preferred.