Mechanical Temperature Gauge Adapter

Mechanical Temperature Gauge Adapter, 3/8" NPT MALE TO 5/8-18 Temp Probe Adapter

PART# 991273ERL

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Earl's Mechanical Temperature Gauge Adapters make installation of coolant temperature or transmission temperature gauges a snap. Theses adapters are lightweight aluminum and feature a red anodized finish. Fits most mechanical temperature gauges with 5/8"-18 probe and tapered seat.


  • Aluminum
  • Red Anodized
  • 3/8” NPT
  • Fits Temperature Sensors w/ 5/8”-18 Threads and Tapered Seat
  • Ideal for Use w/ Most Mechanical Temperature Gauges
  • Lighter Weight and More Attractive Than Brass Adapters
  • Fits Most Autometer® & other brand gauges


Adapter NPT Size ( A )3/8" NPT Male
Adapter Port Size ( B )5/8-18
Adapter TypeMechanical Temperature Gauge
FinishAnodized Red
Material2024 Aluminum
Product LinePremium
Product TypeMechanical Temp Gauge
Part Number991273ERL
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