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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 Male AN -3 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). Blue anodized 2024-T8 aluminum construction. Made in the USA.


  • M16 x 1.5mm – Fits GM LS Series Engine Blocks
  • -3AN Male - Connection for Hose End
  • Blue 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 AN Size ( A )3 AN MALE
Adapter TypeOil Pressure Adapter
Emission Code5
FinishAnodized Blue
Material2024 Aluminum
Metric Thread ( B )16MM X 1.5
Product LinePremium
Product TypeAN to Metric
Part Number9919AFJERL

Service Parts



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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        Some parts are not legal for use in California or other states with similar regulations.

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