InterMotive offers Advanced Fast Idle System II Variable Speed (AFISII VS) for Ford (gas and diesel) and Chevy 6.6L vehicles. AFISII VS allows the installer to set the high idle rpm level for their individual vehicle needs. One part number works on E-Series, F-Series, Crown Vic, Expedition, Excursion, Explorer, Chevy 610 G van and GMT560. It's ideal for the police markets and the "Plug ' Play" connectors allow quick and easy installation in about 15 minutes.