VDO Oil Pressure Gauge Although these will not fit in your dash they are a nice addition for cars that do not have a oil pressure gauge. Diameter is 2-1/16 inch and require a special bracket or custom installation. Choose from 0-80psi or 0-150psi. (some applications) and single pole (will not operate idiot light) or double pole (operates idiot light). Gauge kits are packaged complete with sending unit. Learn More