Ford Diesel Compression Test Adapter_x000d_When the glow plug is removed from the cylinder, this_x000d_adapter is used to connect the No. 5021 gauge to perform a_x000d_compression test._x000d_• Works on 1994–newer Ford vans and pickups with 7.3L_x000d_direct-injected turbocharged (DIT) diesel engine._x000d_No. 6076 – Ford diesel compression test adapter.