Compte-tours avec horamètre San Giorgio SG181 - vue de face, cadran 0-4000 tr/min

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Compte-tours San Giorgio SG181 - bornier arrière 12/24 V, W et éclairage

Compte-tours San Giorgio SG181 - vue de profil opposée

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San Giorgio S.E.I.N.

SG181

Tachometer with Hourmeter San Giorgio SG181 - 0-4000 rpm

Marine tachometer San Giorgio SG181 with LCD hourmeter, 0-4000 RPM range, 12/24 V power supply and W terminal input. 85 mm cutout, LED backlighting, screw-terminal connection and IP67 protection per current Kent datasheet.

Retail priceBenefit from the professional rate

166,72€

166,72€ ~~188,80€~~

Tax included. Shipping calculated at checkout.

Low stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Technical specifications

Product use	Measures engine RPM and operating time
Measurement type	Engine load, runtime
Measurement subtype	Rotation speed, elapsed time
Display type	LCD
Measurement range	0-4000 RPM
Measurement unit	RPM, hours
Power supply voltage range	12/24 Vdc
Backlit	Oui
Panel cutout dimensions mm	85
Bezel color	Black
Mounting type	Flush-mounted
Ingress protection	IP67
Communication protocol	Analog signal (W terminal)
Calibration method	UP and DOWN pushbuttons
Connector type	Screw terminal block
Integrated Functions	Hourmeter, Voltage display
Manufacturer Model	VSG10445/V
Max Input Signal Frequency	5
Min Input Signal Voltage	10
Number Of Connector Pins	4
Pointer Color	White

Detailed description

The San Giorgio SG181 combines an analog 0-4000 rpm tachometer and an hourmeter on an LCD display. It allows monitoring engine RPM and operating hours from a single dashboard instrument.

Main Features

fixed range: 0 to 4000 rpm;
power supply: 12 or 24 V DC;
cut-out diameter: 85 mm;
RPM input: alternator W terminal or compatible inductive sensor;
integrated hourmeter and LED lighting;
connection via four-way screw terminal block: +, -, W, and lighting;
IP67 protection rating according to the current Kent datasheet.

Installation and Calibration

For an installation with a W terminal, the SG181 must be calibrated by comparing the displayed RPM to a reference measurement, then adjusting the value with the UP and DOWN buttons. With an inductive sensor, the manual indicates a signal of at least 10 V peak-to-peak and a maximum frequency of 5 kHz.

The range manual mentions other factory-configurable scales. The SG181 / VSG10445-V reference sold here remains the 0-4000 rpm model.

Documentation

Type	Nom
	FR - Manuel installation et utilisation - Compte-tours San Giorgio VSG Line
	FR-EN - Catalogue fabricant 2025 - Compte-tours San Giorgio VSG10445-V

Expert opinion

« A simple tachometer for engines with W terminal »

The SG181 is suitable for engines with a W terminal on the alternator and for 12 V or 24 V installations. Before replacement, check for the presence of this output, the 85 mm bore, and the 0–4000 RPM range. The integrated hour meter simplifies maintenance tracking.

This model does not communicate over NMEA 2000: it directly measures an RPM signal. Calibration must be performed after installation using a reliable reference measurement.

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Tachometer with Hourmeter San Giorgio SG181 - 0-4000 rpm

166,72€

166,72€ ~~188,80€~~

Frequently Asked Questions

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What does the San Giorgio SG181 tachometer measure?

It displays engine RPM from 0 to 4000 rpm and logs operating hours on its integrated LCD hourmeter.

What power supply is required?

The SG181 operates on 12 or 24 V DC. The manual recommends protection via fast-blow fuse or circuit breaker.

What hole size is required for installation?

The cutout diameter specified for this reference is 85 mm.

How does the SG181 measure engine RPM?

It normally connects to the W terminal of the alternator. It can also receive a signal from a compatible inductive sensor.

How is the rear terminal block connected?

The terminal block has four connections: positive power, negative power, W signal, and lighting power supply.

How to calibrate the tachometer?

After installation, compare the displayed RPM to a reference measurement, then use the UP and DOWN buttons to adjust the reading.

Can the 0-4000 RPM range be modified by the user?

No. The SG181 / VSG10445-V is the 0-4000 RPM version. The other scale ranges mentioned in the range manual correspond to factory settings requiring a special activation.