The 12 position universal trim pot is for use on virtually any Engine Management System, such as the AEM EMS. Use the trim pot to adjust a number of trims, including ignition timing, fuel, boost, etc. This includes: 12 position trim pot with flying lead, 2 brushed silver trim position decals with ranges from -5 to +6 and 0 to +11, blue/red/black AEM logo knob decals and blue/red/black colored knob decals. All AEM 12 Position Trim Pots include a flying lead with a weatherproof over mold and 12 inch insulated wires that are color coded in black, white and red 3/8 inches mounting hole required 1/2 inches wrench used to tighten the jam nut