ummm.. no to all those...

get a racing liquid filled one. it runs about 70-80 bucks but well worth it. EXTREMELY accurate and has a slow bleed valve on it so you can watch and measure the pressure as you release it to where you want it.

longacre, intercomp, etc.... all good stuff and will last you a lifetime versus the cheaper then 50 dollar models that break in under 3 years or lose its accuracy...

PS: not all tire pressure gauges measure the same.... each gauge will measure different unless you have them calibrated to each other... if you measure at home and then at the gas station, you will get different readings. stick to one guage only...

just so you know...