Go to your local Speed Shop and look at their models. Some of them are liquid filled, some are even illuminated!! But plan on spending a good $50.00 for a decent one. 2 lbs of Air in my Dixie tires is equal to 5/8" at ends of deck! So accuracy IS just as important as Drag Slicks. Also, now that it is getting cooler out, check your pressures again as temps here are in the high 40's in the morning.
NAPA auto parts carries a 0-20 lb. gauge for less than 20 bucks. I've used mine for 3 years with no problems. Like dixie1 said, Dixie Choppers are critical for proper tire pressure. Who knows if a gauge is accurate, but as long as you are using the same gauge for all the tires it doesn't matter if its a pound off.