Radio station KGIL-AM (1260) on Monday is replacing veteran talk-show host Michael Jackson with Laura Ingraham. Ingraham will be heard on KGIL weekdays from 6-9 a.m. The British-born Jackson began on L.A. airwaves in 1963 and was heard on KABC-AM (790) for three decades. He came out of retirement last October after five years to take the gig on KGIL. The conservative Ingraham, the most listened-to woman in political talk radio, is currently heard in 23 of the top 25 metropolitan markets.