3 Bar PMS for 86-93 Mustangs. Unlock the Performance Potential of your EEC-IV with Engine Tuning Adjustability Not Available in any Performance "Chip"! The P.M.S. goes far beyond the capabilities of a performance "chip", offering a broad selection of adjustments and tuning. Now you can take advantage of aftermarket performance components while still using the stock engine control computer! Step up to the P.M.S. and move into tomorrow's world of performance! Tune your Engine's Performance with these great features: Air/Fuel Mixture fully adjustable. Idle Mixture and Timing fully adjustable. Programmed Rev-Limiter up to 9,200 RPM! Total spark and rate-of-advance fully adjustable! New purple anodized, finned aluminum case resists corrosion, dirt and moisture! Two new progammable RPM/Throttle output accessory control switches! Easy installation in less than one hour! "Plug in and Run" installation requires no programming - just start it up and go! Increased RAM, EPROM and EEPROM Internal Memory Capacity! Tuneable Nitrous Oxide Adjustment Table! Tuneable Turbo or Supercharger Boost Adjustment Tables! Three new Data Display Screens let you monitor fuel/air mixture, spark timing, injector function, oxygen sensor, manifold pressure/vacuum, boost or nitrous! Monitors and displays actual air-flow in lbs/hr or CFM (Mass Air Only). Easy "User Friendly" operation - detailed owner's manual explains all functions!