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Earl's GM LS Oil Pressure Gauge Adapter FittingsYouTube Button

Earl's GM LS Oil Pressure Gauge Adapter Fittings

Earls Straight 1/8" NPT Female to M16 x 1.5mm w/ Crush Washer.


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Earl's new adapter fittings are ideal for installing an after-market oil pressure gauge on GM LS engine swaps. These fittings screws directly into the M16 x 1.5mm oil passage on the rear china wall of the GM LS engine block. Options are available to fit most after-market sending units or mechanical gauge hoses (1/8" NPT female, -3 AN male, or -4 AN male). Black anodized 2024-T8 aluminum construction. Made in the USA.


  • M16 x 1.5mm – Fits GM LS Series Engine Blocks
  • 1/8” NPT Female Works w/ Most After-Market Sending Units
  • Black Anodized Finish
  • 2024-T8 Aluminum – More Durable than 6061-T6
  • Simple & Easy Adapter Fitting for Installing After-Market Gauges on GM LS Engines
  • Can Also Be Used on Other M16 x 1.5mm Plumbing Applications
  • Made in the USA


Adapter NPT Size ( A )1/8 NPT FEMALE
Adapter TypeOil Pressure Adapter
Emission Code5
FinishAnodized Black
Material2024 Aluminum
Metric Thread ( B )16MM X 1.5
Product LinePremium
Product TypeGauge Adapter
Part NumberLS0021ERL

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This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

Metric Adapter Fittings Must Be Used w/ the included Crush Washer.


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