An ideal tire gauge (for me) is one that:
1. Reads accurately to 0.5 psi.
2. Stores easily on the motorcycle without taking much space. (Read: Fits in my KGT glovebox along with the other stuff in there, including the SPOT 1 that sits on top.)
3. Stays accurate over many years (and miles) without recalibration, despite being stored on a motorcycle that shakes and vibrates and endures ambient temperatures that range from well below freezing to well above 100 F.
4. Fits easily between the brake rotors and wheel "spokes" on my KGT rear wheel, to measure tire pressure without an "L" adapter. (It must also be easy to use on other vehicles - bicycles, cars, etc.)
5. Seats and seals easily and dependably on the valve stem without leaking air, first time, every time.
6. Uses very little air to measure tire pressure. In other words, you don't lose 0.5 psi every time you measure the tire pressure.
7. Offers a simple and easy way to bleed air from the tire when you fill it, so you can quickly and efficiently set the tire pressure to the desired value. (A simple valve stem "presser" is fine, though it is surprising how few of the high-quality gauges have one. I would prefer a clamp with a bleeder button, though.)
(Note: The numbers are not in any particular order, but included to make discussion easier.)
I have yet to find a gauge that meets all of the above requirements. Maybe one of you can suggest a gauge that comes close.