The vehicle may lose vehicle speed signal, which can affect speedometer operation and transmission shift quality. Most often the Vehicle Speed Sensor is faulty, however, at times, the driven gear inside the transmission is at fault. Replace the Vehicle Speed sensor and inspect the driven gear upon sensor removal.
Car Problem Reports
Ford Tempo Speedometer Operation Affected and Poor Transmission Shift Quality
Ford Tempo Problem
Drive Train Affected: 2WD
Average Mileage: 105,500 mi (79,000 mi - 130,000 mi)