TA303 SmarTach : Diesel and Gasoline Engine Tachometer

Who it’s For:

  • Test stations which need an independent way to check/verify engine RPM
  • Construction equipment maintenance shops doing PDIs or calibration/tuning
  • Marine technicians needing to tune carburetors or governors on inboard engines

What it Does:

Quickly and easily detects engine RPM on gasoline or diesel engines equipped with alternators. The TA303 is especially useful when the engine bay must be closed during a test.

How it Works:

  1. Turn on the engine, and wait for the engine to come to a steady idle
  2. Connect the TA303 leads to the battery, or connect to a cigarette lighter adapter if available
  3. Select the engine parameters (cycle and number of cylinders)
  4. Allow the TA303 to automatically calibrate (which usually takes about 10 seconds)
  5. View the engine RPM

Warranty & Support:

Covered by our standard 1-year warranty, and supported for much longer. Replacement parts and accessories are generally available for 10+ years.

USD $329.45

Quick Links


The TA303 SmarTach is a tachometer designed for use on any engine equipped with an alternator, and only requires a simple connection to the electrical system (e.g. battery, alternator, cigarette lighter connector) to measure engine RPM. Taking advantage of the ripples generated by the alternator, the TA303 automatically calculates the relationship between the speed of the engine and the alternator ripples, and uses them to measure RPM on any piston engine regardless of its ignition system (Diesel or gasoline).

The TA303 does not require direct contact or line of sight to rotating parts, or reflective tape like with optical tachometers, or mounting of special sensors or pickups, or other specialized equipment. It comes with the cables to connect to the battery or other accessible power outlet, a cigarette lighter socket connector and 10′ extension cable.



  • Exhaust emission testing
  • Exhaust noise testing
  • Heavy equipment
  • Lawnmowers
  • Automotive
  • Agricultural
  • Industrial
  • Marine



  • Input voltage range: 9 to 42 Volt DC
  • Maximum input voltage: ± 42 Volt DC / 30 Volt AC
  • Power consumption: 0.15 Amperes DC maximum
  • Display: Large 4-1/2 Digits LCD + number of cycles and number of cylinders indicators
  • Tachometer Range: 200 to 9,999 RPM
  • Number of Cylinders: 1,2,3,4,5,6,8,10 and 12
  • Number of Cycles: 2 and 4 Cycles
  • Accuracy: ± 0.5% + 2 LSD
  • Response time: < 0.3 Seconds (above 200 RPM)
  • Input connector: BNC Jack
  • Cables and accessories:
  • 59″ (1.5 m) cigarette lighter socket connector
  • 79″ (2.0 m) with battery alligator clips
  • 118″ (3.0 m) extension
  • Physical dimensions : 6.4″(H) x 4.0″(W) x 1.5″(D) or 160 mm x 102 mmx 38 mm – including holster but excluding cables
  • Weight: 9.0 oz. or 255 g (without cables)



  Download Brochure (English)

  Download Manual (English)

  Download Manual (Russian)

Kit Manifest

  • TA303 (core unit)
  • Protective rubber holster
  • Hard padded case for carrying and storage
  • Cigarette lighter socket connector cable
  • Battery connectors cable
  • Extension cable
  • User’s Manual


Proposition 65 Warning ⚠

This product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer, and Bisphenol A (BPA), which is known to the State of California to cause birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov.