Description:

Stewart Warner 421021 Speedometer:

 Part Number: 421021.

• Type: Vintage speedometer FACEPLATE.
• Display Type: Analog.
• Range: 0-80 MPH (miles per hour).
• Compatibility: Universal fitment for various vehicles.

  ANALOG MECHANICAL GAUGE (PART #421021)

  Part Number: 421021 Type: Analog Mechanical Gauge Scale: 0–80 (units depend on application) Condition: New / New Old Stock (NOS) Category: Industrial Instrumentation / Mechanical Indicators

  FITMENT / APPLICATION MATRIX

  Based on typical usage of 0–80 mechanical gauges in industrial and marine systems

  Equipment Type	Application	Notes
  Industrial Engines	Oil pressure / governor pressure	Common 0–80 PSI range
  Generators (Gensets)	Oil pressure or auxiliary pressure	Used on Onan, Kohler, Hobbs panels
  Air Compressors	Pressure indication	Often 0–80 PSI for low‑pressure systems
  Marine Engines	Oil pressure or system pressure	Universal panel‑mount
  Heavy Equipment	Hydraulic or auxiliary pressure	Depends on system spec
  Custom Panels	Any 0–80 mechanical indication	Hot rods, tractors, custom builds
  Agricultural Equipment	Engine or system pressure	Universal compatibility

  DESCRIPTION

  For sale is a mechanical analog gauge, part number 421021, featuring a clear 0–80 scale with bold white numerals on a black face. This style of gauge is commonly used in industrial engines, generators, compressors, marine equipment, and heavy machinery for monitoring pressure, vacuum, or speed depending on the system.

  The gauge is clean, intact, and ready for installation — ideal for equipment restoration, panel rebuilds, or replacing a failed or inaccurate indicator.

  
  

  FEATURES

  • Clear 0–80 scale for easy visibility

  • Mechanical movement — no external power required

  • Black face with high‑contrast white numerals

  • Durable metal housing

  • Universal panel‑mount design

  • Ideal for industrial, marine, or generator applications