Greddy 11900575 Union No.5 Oil Pressure Sensor Adapter 1/8PF to M12 x P1.25

The Greddy 11900575 is a Union No. 5 thread adapter designed to convert a 1/8" PF (British Standard Parallel Pipe) female port to a M12 x P1.25 male metric thread. This compact brass fitting allows GReddy oil pressure sensors — which use the common JDM 1/8PF thread standard — to be installed into engine block ports or oil galleries threaded to the M12 x P1.25 metric specification, as found on Nissan SR20 and Toyota 1JZ/2JZ engines.

Constructed from brass with chromium (Cr) plating, this union fitting offers excellent corrosion resistance and durability in high-temperature oil system environments. It is part of GReddy's comprehensive lineup of union adapters and fittings, engineered to simplify the installation of aftermarket gauges and monitoring sensors without requiring custom machining or thread chasing.

Key Features:

• Thread conversion: 1/8" PF female to M12 x P1.25 male
• Material: Brass with chromium (Cr) plating for corrosion resistance
• GReddy Union Series Figure No. 5
• Specifically noted for use with oil pressure sensor extraction on SR20, 1JZ, and 2JZ engines
• Compatible with GReddy Sirius, Informeter, and other 1/8PF-threaded oil pressure sensors
• Note: 1/8PF (JDM standard) is not the same as 1/8 NPT — verify sensor thread before installation

This fitting is an essential adapter for builders and tuners installing oil pressure monitoring on popular JDM platforms. It pairs seamlessly with GReddy's full range of oil pressure and temperature sensors, gauge kits, and oil block adapters.