Earl's Performance LS0021ERL GM LS Oil Pressure Gauge Adapter Fitting 1/8 NPT Female to M16 x 1.5mm

The Earl's Performance LS0021ERL is a precision-machined oil pressure gauge adapter fitting designed specifically for GM LS engine swaps and builds. This straight adapter converts the factory M16 x 1.5mm oil pressure port on the GM LS block to a standard 1/8" NPT female connection, allowing easy installation of aftermarket oil pressure sending units or mechanical gauge hoses without stacking multiple adapters.

The fitting threads directly into the M16 x 1.5mm oil passage located on the rear china wall of the GM LS engine block — a notoriously difficult port to plumb due to its unique metric thread size and tight location. Earl's engineered this adapter to solve that problem cleanly and reliably in a single fitting.

Key Features:

• Straight configuration: 1/8" NPT Female to M16 x 1.5mm Male
• Material: Black anodized 2024-T8 aluminum — stronger and more durable than standard 6061-T6
• Compatible with: Most aftermarket oil pressure sending units and mechanical gauge hoses
• Crush washer included — required for proper sealing on this straight-thread metric fitting
• Fits all GM LS series engine blocks
• Made in the USA
• Legal for use on emissions-controlled and non-emissions-controlled vehicles

Unlike NPT tapered threads that seal with thread tape or pipe sealant, this is a straight-thread metric fitting that must be sealed with the included crush washer. Earl's also offers companion fittings in -3 AN male and -4 AN male configurations for AN hose plumbing setups. A trusted choice for LS swap builders and racing teams alike.