Our oil pressure adapter allows you to install an aftermarket oil gauge or turbo oil feed in-line with your original oil pressure switch. Accepts 1/8″ NPT senders and fittings. This adapter will work on most BMW engines including: M10, M20, M30, M42, M50, M52, S50, S52, S14, S38 & more. This fitting is steel, zinc coated, made in the USA, and includes a copper crush washer. We also offer the option to add a new oil pressure switch.