A one piece transparent Acrylic Oil Level Gauge may be used on the tank or conservator. The oil enters from the bottom mounting bolt and rises into the central, vertical, formed tubing indicating its presence. A predetermined slot indicates the filing level of oil. To give a contrast and to view the clear oil the background is printed red. The mounting bolts of brass having allen key formation have ‘O’ Ring and gaskets for leakproofness. Available in any length, this oil level gauge is sturdy, fully transparent and smart in appearance.