These sending units read the air inlet temperatures and send it to the computer to make the correct adjustments for the outside weather conditions. A faulty sensor can cause rough idle and poor driving performance. Pick up your replacement today for your 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993 Fox Body Mustang. We also carry temp sensor connectors to fix any damaged plugs.