Manufacturers of boat motors usually do not offer consumers any measuring devices in the kit. This is due to the particular simplicity of the engines for this purpose. However, in some cases, there is still a need to determine such an important parameter as the number of revolutions. For this purpose, the tachometer for the outboard motor is most often installed.


Tachometers for outboard boat engines make it possible to cope with the following tasks:

  • fine adjustment of the engine;
  • selection of a suitable propeller based on the parameters of the device;
  • prevention of premature failure of the outboard motor;
  • selection of optimal, economical in terms of fuel consumption, mode of operation of the engine;
  • drive failure detection.

Principle of operation

How to choose and install a tachometer for outboard motor?The tachometer is connected to the boat motor through spark plugs, the power wire of which actually acts as a conductor, which transmits electrical impulses to the device. The obtained information is displayed on the device display.

Data regarding engine speed is generated in real time. If we talk about knurled hours, then the indicator is displayed only after the drive stops working.

If necessary, the tachometer for the outboard motor can be reset. In other words - reset the data for a certain period.

Installing the tachometer on the boat motor

The installation procedure of the device does not imply the performance of complex operations that the owner of the craft is unable to handle. To connect the tachometer for the outboard motor, it is enough to connect it to the spark plugs with a power wire. To do this, you must make several turns of the cable, fastening the last with electrical tape.

It is worth noting that the connecting wire must be removed from the ignition coil. Otherwise will significantly increase the likelihood of so-called spurious pulses which will negatively affect the formation of accurate device readings.

In conclusion, it is necessary to fix the measuring device on the dashboard of the motorized watercraft. For this it will be enough to use the simplest fasteners in the form of bolts, screws or self-tapping screws.

Fixing the tachometer for the outboard motor, will have to take care of the power cord. This will require wiring to connect the device to the high voltage cable.

In order to properly rebuild the measuring device, it is necessary to compare the number of revolutions of the engine when operating at idle (the indicator can be obtained from the technical documentation) with the data when the tachometer is switched to the same mode. In case of discrepancy of the received information, you will have to configure the device using the instructions.

If you have to deal with a universal tachometer, you must select the mode of operation aimed at fixing the number of pulses during one revolution of the engine crankshaft. In this case, the setting is done with the engine off.

Today, boat tachometers available on the market in all its diversity. Domestic consumers are represented as models of well-known manufacturers and production of virtually unknown brands. To acquire a reliable, functional device and avoid experience with the fakes is to ask the opinion of friends, experienced users, to communicate with experts.

Giving preference to the most functional tachometer, you need to understand that most of the possibilities here will be useless without the purchase of sensors, the installation of which will provide the appropriate measurements. This will entail additional material costs, leading to the need to find solutions for performing complex installation.

According to the majority of owners of motorized boats, the best option is to purchase a tachometer with a single function for counting the hour. This solution will allow running a new engine and determine the remaining resource of the old engine.