The pits burn 24 hours a day, 7 days a week at Hays County Bar-B-Que in San Marcos. Jessie Miranda, the general manager at Hays County Bar-B-Que & Catering in San Marcos, is old school. The joint doesn’t use temperature gauges to judge the doneness of its briskets. It’s all about how the meat looks and feels to the touch. “The only thing we probe is poultry, sausage and sometimes a pork chop,” he said. Miranda is also old school in his approach to competition: Bring it on. “We got room to go,” he said. “There’s plenty business for everybody.…