GM-21867-A is a pressure gauge kit for testing engine or transmission oil pressure. This kit will provide two gauge heads with quick-connect plugs, and a pressure hose with a QC socket. The gauges read 0-300 and 0-600 psi, respectively, depending on the operating range needed. Also included are adapters for existing GM engines and transmissions, and a 90 degree and 135 degree 1/8" NPT F to 1/8" NPT M adapters. Also included,  GM-21867-15 -  Heat Resistant Hose