Oil Temperature Gauge, 120 to 300 degrees F, 52mm, 2-1/16"Monitoring oil temp in your air cooled VW engine is crucial, especially if it's a high performance engine. This gauge is of excellent quality, and compatible with VDO 300 degree F sending units. It fits the industry standard 52mm mounting hole. It requires installation of a sending unit. We recommend using a VDO 323 064, which replaces the stock plug in the bottom of your engine case where the relief valve is installed. Easy peasy. Ideally, you want