this is the compressor i have mounted in my trailer, works well and you can hand carry or leave it mounted with 20 ft coiled  hose .

I bought it at Walmart for $50 bucks about 8 years ago and has served me well, has just enough air to seat new tires on the rims..

Campbell Hausfeld  2 Gallon Wall-Mountable Air Compressor

I use a Longacre digital which I used for Karts and My Spec Miata,  its a 0-100 psi, very accurate and measures in tenth of a pound.  I paid about $100 and will buy another if I ever need one.  I have used this for 4 years already

Longacre 53000, slightly different than mine as it is 0-60 psi

Todd, found this one to be accurate and didn’t break the bank.

http://www.jegs.com/i/JEGS+Performance+Products/555/65035/10002/-1

I had a Longacre digital one for awhile, until I realized it was 2 lbs off, then it hit the junk pile.  One of the nicest I’ve ever used is the Intercomp digital, but it was pretty pricey at nearly $300.  The one I use now, and that is quickly becoming the standard with tuners, is the Hi Prema, made by Prisma.  KartSport distributes them and they are generally around $200.  It has a 76lb max, with .1 lb resolution and a 4 tire memory.

I have this one and love it, although it is hooked to my air compressor ,

I can air up the tire then bleed off the air to get the exact pressure I want .

glows in the dark with a big number  dial indicator for old eyes…

http://www.intercomp-racing.com/category/Air_Pressure_Gauges.cfm?PageNum_GetItems=3

http://www.ebay.com/itm/New-Intercomp-Fill-Bleed-Read-Tire-Pressure-Gauge-/261377087422