Earl’s GM LS Oil Pressure Gauge Adapter Fittings

Earls Straight 1/8” NPT Female to M16 x 1.5mm


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Metric Adapter Fittings Must Be Used w/ a Crush Washer.


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

Tech Resources

Metric Adapter Fittings Must Be Used w/ a Crush Washer.
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        Some parts are not legal for use in California or other states with similar regulations.