The OTC Oil Pressure and Prelube Adapter, No. 7297, installs in place of the spin-on oil filter to allow existing oil pressure gauges to attach and test oil system pressure. It can also be used to connect prelube equipment to the engine. For use on 2005 and later GM Gen IV and Gen V engines: 4.8L, 5.3L, 6.0L, and 6.2L.