Gearbox

1 Moroso 89560 Tire-Pressure Gauge

Moroso's 89560 is about the least-expensive racing gauge on the market. Its small, 2.6-ineh face takes just a tick longer to read than the others, but what do you want for S37? features include the basic bleeder valve, angled nozzle with swivel chuck, and 15.5-inch hose with a handy contoured rubber grip. A rubbergauge cover sells for an extra $5, but it's worth it for the additional protection it provides, (gauge, $36.95; cover, $4.95; 203-453-6571; www.moro90.com) TEST NOTES: The Morosoiseasytouseand affordable. Our only minor complaint isthatits hose is stiffer than the others. BEST FOR: The nevvbie racer or autocrosser.

2 Longacre Temperature-Compensated Digital Tire-Pressure Gauge

Generally speaking, for every 10 degrees of temperature change, tire pressure will adjust by roughly 1 psi. So if a racer sets his pressures in the cool morning, tire inflation can rise in the afternoon heat. This Longacre gauge can factor in each tire's temperature and provide a corrected pressure by combining a traditional pressure gauge and a tire pyrometer in one unit. We're a bit skeptical that the relationship between surface temps and internal air temperature is the same for all tires, but the Longacre takes out most of the guesswork. For error-free record keeping, the gauge stores the most recent pressures and temperatures. It's the priciest of the bunch by far, but a typical tire pyrometer can run about 8100 to 8300 on its own, and a metal case is included. ($374.90; 800-4233110; www.longacreracing.com)

test notes: Despite all the features the Longacre packs, it is very easy to operate.

best for: The serious racer lookingto limit his pit tools.

1 Intercomp Racing Products Fill, Bleed, & Read Air-Pressure Gauge

Timing is everything in racing, on the track and in the pits. Conditions can change in an instant, often requiring lastminute tire-pressure adjustments. Intercomp has come up with a slick way to speed up pressure adjustments with its Fill, Bleed, 8c Readgauge. Attach it to your compressor or portable air tank, and you can check pressures and adj ust them up or down using the same nozzle. There's a bleeder valve on the backside as well as a thumb-operated valve on the front that allows the user to add air from a designated source. This unit can function as a stand-alone gauge as well, and its large, four-inch, glow-in-the-dark face makes reading it a snap. (8139.00; 800-328-3336; www.intercomp-racing.com) test notes: The four-inch face on this gauge is easy to read, but how about some hash marks for fractions of psi? best FOR: The obsessive pressure adjuster.

Joes Racing Digital Tire-Pressure Gauge

Digital gauges are less prone to reader error than traditional analog devices, but they're typically a lot pricier. Joes Racing Products, however, has recently introduced this digital racing gauge at a very reasonable price. It features an auto-off function, a low-battery indicator, an easy-to-read blue-lit display, and the flexibility to toggle among different units of measurement with the touch of a button. It also comes with a digital tread-depth gauge and both ball and angle-type nozzles. (S69.95; 425-267-9199; vvww.jocsracing.com) test notes: The tough-to-seal angled nozzle meant we lost precious psi with every pressure check; use the ball nozzle. best for: The techie club racer on a budget.

£ Accutire MS 4021B Standard Digitid Tire Gauge

Remember the old pencil-type gauge that painfully dimpled your thumb and required a magnifying glass to read? Well, this Accutire gauge is the 21st-century equivalent, with a straightforward backlit LCD display, a rubberized handle, and sturdy plastic construction. It reads pressures from 5 psi to 150, and its ease of operation won't leave anyone misinterpreting its measurements. Affordable and compact, this gauge should be in every commuter's glove box. ($14.99; www.accutiregauge.com) test notes: The Accutire reports in half-psi increments only; obsessive track rats will want more precision. best for: Evervroad car.

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