MT90 Speed/Time Sensors

The Murphy Selectronic MT90 digital tachometer offers high accuracy and dependability resulting from use of a quartz crystal time based and digital, solid-state electronics.

Tachometer power is supplied by either a Murphy magnetic pickup, mounted at the flywheel ring-gear of an engine, or by a 12, 24 or 32 volt DC battery system.

RPM data is supplied by either a Murphy magnetic pickup or by the alternator in your battery charging circuit. The MT90 tachometer also has back-lighting for easy readings in low lit areas; this lighting requires a battery power source.

• ±1 RPM Accuracy
• Easy Calibration
• Clear-Read LCD Display
• Back Light for Night Viewing (Battery Powered models)
• Input Source Can Be a Magnetic Pickup or Engine Alternator
• Power Supplied by Magnetic Pickup or 12, 24, or 32 VDC Battery System

  • Notes

    Signal Input Voltage: 4 to 35 Vrms from a magnetic pickup or alternator.

    Pulses per Revolution: 3 to 999.

    Power Requirements: Pickup Power: 4-35Vrms; Battery Power: 8-40 VDC (12, 24, 32 volt).

    Current: Tach back-light Off, 4mA @ 40 VDC.; Tach back-light On, 25 mA @ 40 VDC.

    Case: 1018 polycarbonate/polyester blend.

    Lens: Polycarbonate.

    Bezel: #430 Stainless Steel.

    Display: LCD, 4-digit, seven segment.

    Operating Temperature: -4 to 158°F (-20 to 70°C).

    Storage Temperature: -13 to 185°F (-25 to 85°C). Mounting Hole: 3-7/16 in. (87 mm).

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Service done right

Murphy by Enovation Service Network

Palmer Johnson's six-location factory-authorized service center network features:

  • Factory-trained technicians
  • Field service
  • Onsite troubleshooting and diagnostics
  • Unit removal and installation

For Murphy by Enovation service, call 1-800-341-4334.

Learn more

Madison, WI

Service Center

Service: (608) 834-5206

1835 Haynes Dr
Sun Prairie, WI 53590


Dallas, TX

Service Center

Service: (817) 505-2430

608 112th St
Arlington, TX 76011


Denver, CO

Service Dealer

Service: (720) 724-0033

5151 E 56th Ave
Commerce City, CO 80022


Kansas City, KS

Service Center

Service: (913) 202-6944

15360 South Mahaffie St
Olathe, KS 66062


Los Angeles, CA

Service Center

Service: (562) 356-1590

12020 Bloomfield Ave
Santa Fe Springs, CA 90670


Oklahoma City, OK


Sales: (800) 341-4334

Oklahoma City, OK 73128


Phoenix, AZ

Service Dealer

Service: (602) 253-0214

2401 S. 19th Street
Phoenix, AZ 85034


San Francisco, CA

Service Dealer

Service: (510) 342-2212

1930 W Winton Ave #14
Hayward, CA 94545


St. Louis, MO

Service Center

Service: (636) 203-9811

578 Rudder Rd
Fenton, MO 63026


Philadelphia, PA

Service Dealer

Service: (215) 822-8300

159 Discovery Dr
Colmar, PA 18915


Fort Myers, FL

Service Dealer

Service: (239) 693-7477

4821 Waycross Road
Fort Myers, FL


Vancouver, British Columbia

Service Center

Service: (604) 879-6731

6741 Cariboo Rd Unit 205
Burnaby, British Columbia V3N 4A3


Edmonton, Alberta

Service Center

Service: (780) 434-9578

3804 53rd Ave NW
Edmonton, Alberta T6B 3N7


Seattle, WA

Service Center

Service: (425) 251-3434

1710 136th Ave E Suite 200
Sumner, WA 98390


RECON Equipment Center, WI

Service Center

Service: (608) 834-5220

1828 Haynes Dr
Sun Prairie, WI 53590

Map of Palmer Johnson Power Systems locations