1995 Chevy Camaro low-trac light is coming

1995 Chevy Camaro mileage: 60,000. My low-trac light is coming on in DRY weather the dealer says it's probably a wheel sensor. My husband can replace it if he knows where the wheel sensors are or at least he 'thinks' he can depending on where they are. He thinks it's a front left sensor, is there a way besides connecting the car to a computer to see which one it is? Can he put a new one in and if it's not that one, put back the old one and put the new one in another place? We don't want to spend $300-$400 to have the dealer do it if George can do it!