We all know how important it is to keep your air-cooled VW from overheating.  This gauge will help you monitor the actual temperature of your engine while you're driving.  This oil temperature gauge is of excellent quality.  It is manufactured in Great Britain by Smiths Instruments, who has been manufacturing quality automotive gauges since 1900.  It fits the industry standard 52mm mounting hole. Manufactured exclusively for EMPI. This gauge is electrical, and requires installation of a sending unit to read properly.  We recommend VDO sender 323-064, which replaces the stock pressure relief valve plug on Type 1 engines, and is super easy to install.