Murphy Digital Tachometer and Hourmeter 8-40 VDC w/ Overspeed Switch - MTH6-1


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0.72 LBS
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The Murphy Digital Tachometer and Hourmeter MTH6-1 is a microprocessor-based type with a built-in overspeed switch. It measures speed and running hours and can give an alarm or shut down the engine on overspeed. The MTH6 case is polycarbonat  and its dial measures 3-1/2 inches (89 mm) in diameter.

RPM data for the tachometer and overspeed switch is supplied by a magnetic pickup or battery charging alternator. The magnetic pickup is installed into the flywheel housing of an internal combustion engine. The starter ring gear acts upon the magnetic pickup to generate a voltage pulse each time a gear tooth passes the end of the sensor.


  • Powered by 8 to 40 VDC
  • Large 5-Digit LCD Display
  • 3-1/2 Inches (89 mm) Diameter Dial
  • Maintains Hours Count When Power Is Lost
  • Front Panel Programming
  • Hours Can Be Reset to Zero
  • Tachometer and Hourmeter With Overspeed Shutdown or Alarm Switch
  • Reads RPM Data from a Magnetic Pickup or Battery Charging Alternator



  • Part No.: MTH6-1
  • Power Requirements: 8-40 VDC (12, 24 or 32 VDC systems)
  • Maximum Current: 12 VDC: 0.011 A, backlight Off; 0.025 A, backlight On/ 24 VDC: 0.008 A, backlight Off;0.015 A, backlight On/ 32 VDC: 0.007 A, backlight Off;0.010 A, backlight On
  • Operating Temperature: 4° to 158°F (-20° to 70°C)
  • Storage Temperature: -40° to 185°F (-40° to 85°C)
  • Case: 1018 Polycarbonate/Polyester blend.
  • Mounting Hole Diameter: 3-3/8 inch (86 mm)
  • Speed Input: 4.5 Vrms minimum
  • Overspeed Switch Rating: 2A, 50 VDC
  • Overspeed Range: 0 to 9000 RPM
  • Pulses per Revolution: 4 to 255
  • Tachometer Range: 0 to 65,535 RPM
  • Tachometer Accuracy: +/- 1% of the display reading or -2 rpm, whichever is greater
  • Input Frequency Range: 25 Hz to 20 kHz
  • Hourmeter Range: 0 to 99,999 hours
  • Hourmeter Resolution: +/- 0.1 hour up to 9,999.9; +/- 1 hour 10,000 and up
  • Reset Hourmeter: Apply temporary ground to terminal #5 to reset hours to zero
  • Shipping Weight: 14 oz. (435 g.)
  • Shipping Dimensions: 5-1/2" x 5-1/2" x 5-1/2" (140 x 140 x 140 mm)

Product Condition: NEW
Murphy Digital Tachometer and Hourmeter with Overspeed Shutdown or Alarm Switch MTH6-1

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