Used to bench test the camshaft support plate to ensure the working of oil pump pressure relief spring; a correct sealing relief valve and correct pop-off pressure to solve any issues in the engine before it hits the road. Works with all Twin Cam support plates. Includes air regulator; 0-100 psi pressure gauge; gasket & required hardware. Note: Perfect to test the Feuling 566114 oil pressure relief spring; enabling you to set pop-off pressure to your preference. Note: Feuling recommends 0-30 psi with full pop-off at 55-60 psi. Note: For replacement parts see 566118 gasket and 588063 air regulator.