Fitment: The compression test adapter is designed for Ford 6.0L Diesel Engines. Suitable for 2003-2006 Ford pickups and vans with 6.0-liter diesel engines Fits for ESST Left Nav 303 Engine; Fits for 2004-2010 E-Series 6.0L Diesel Engines; Fits for 2004-2005 Excursion 6.0L Diesel Engines; Fits for 2004-2007 F-250/350/450/550/650/750 Super Duty 6.0L Diesel Engines; Fits for 2006-2009 Low Cab Forward Engine System. Fits for 2008-2010 F-250/350/450/550 Super Duty 6.4L Diesel Engines; Features: 1) With the glow plug removed, the compression test adapter can be used to connect the #5021 gauge to a glow plug port for compression testing .