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BOAT ENGINE TEMPERATURE ALARM suits twin engine boats - model TM4-Twin-Marine

BOAT ENGINE TEMPERATURE ALARM suits twin engine boats - model TM4-Twin-Marine
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Item Information:

  • Brand: Engine Watchdog
  • Manufacturer Part Number: TM4-Twin Sensor-Marine

Engine Watchdog TM4 Twin Sensor Marine Audible Engine Protection Alarm

Audible Port & Starboard Engine Temperature Alarm for Twin Engine Boats

TM4 Twin Sensor Marine displays both Port and Starboard engine temperatures and alarms with a Light, Loud Buzzer & Display Messages if an overheating emergency threatens either engine.

Engine Watchdog TM4 Twin Sensor Marine Displays 14 Different Messages

TM4 Twin Sensor Marine detects ALL the causes of Engine overheating, not just coolant loss. These include:

  • Leaking hoses
  • Split radiators
  • Faulty radiator caps
  • Sticky thermostats
  • Water pump failure
  • Coolant blockages
  • Water flow restrictions
  • Oil system problems

To see more technical information and why you should be using the Engine Watchdog TM4 Twin Sensor Marine, see below

Engine Watchdog prides itself on market innovation so the new model TM4 Twin Sensor Marine Engine Temperature Alarm has many features not seen in previous models. New features include:

  • A modern back-lit LCD display that is very easy to read in bright sunlight or at night.

  • The unit displays 14 different information and warning messages so you will always know exactly what's going on.

  • The temperature in the alarm memory briefly displays each time you start up so you know if it has been altered.

  • Water resistant front as standard.

Note: This unit comes in a single sensor version for alarming boats with one engine Search Engine Watchdog TM1

Or a two sensor version for alarming both the Engine & Transmission Temperatures in single engine boats Search Engine Watchdog TM4 Twin Sensor

Not sure the TM4 Twin Sensor Marine is the right unit for you?

Check out our comparison table for all Engine Watchdog products to find which product will best suit your requirements.

TM4 Twin Sensor Marine Specifications and Features:

  • Suitable for all boats, every make and model.
  • LCD display with automatic white back light.
  • Unit displays 14 different alarm and information messages.
  • Unit alarms using an inbuilt 85 db buzzer, indicator light and display messages.
  • The temperature in the alarm memory briefly displays each time you start up so you know if it has been altered.
  • Suits 12 or 24 volt DC systems and is fully reverse polarity protected. Power consumption is only 15 mA with no alarms on.
  • Compact size: Less mounting tabs 80 x 30 x 60mm (3.2" x 1.2" x 2.4")
  • Two different mounting lids are supplied with the unit. One lid comes with mounting tabs at each end for under dash mounting, the other lid supplied has no mounting tabs to allow for installation on and behind the boat dashboard.
  • TM4 Twin Sensor Marine: Maximum display temperature is 125 degrees C. The alarm is set in one degree increments from 1 to 125C.
  • TM4 Twin Sensor Marine F: Maximum display temperature is 255 degrees F. The alarm is set in two degree increments from 34 to 255F.
  • Standard sensor wire length for each sensor is 6m (19.6ft) or they can be ordered to size for longer vessels.
  • Warranty - 2 years from date of purchase. The TM4 Twin Sensor Marine is not a 'throw away' item, it will give a life time of service and replacement parts are inexpensive and freely available.

ENGINE WATCHDOG TM4 Twin Sensor Marine includes two electronic 'Easy Fit' Heat Sensors, Installation kit and simple fitting instructions.

Plus, you get FREE POSTAGE & FREE OPTIONS. See the free options list below.

BUY WITH CONFIDENCE, enginewatchdog09 is the official factory eBay site for Engine Watchdog P/L (Est. 1982)

Buy Australian & get Fully Warranty now and in the future (we're just a phone call away)

Please phone 07-3277 6770 for additional information about this product or if you want to pay using a Visa or MasterCard.

Engine Watchdog TM4 Twin Sensor Marine Supplied with 2 different mounting lids

Free Options

NOTE: The following options are free, but we must be advised prior to shipment by an email or a note in Paypal.

  1. FAHRENHEIT UNIT USA & Canadian Customers – The TM4 Twin Sensor Marine can be switched to read in Fahrenheit, Specify Model 'TM4F' when ordering (reads in two degree increments from 34 to 255 degrees F) Please Note - All TM4's sent to the USA will be TM4F units unless otherwise specified. Canadian customers should still specify the model required.

  2. LONGER SENSOR LEADS The standard sensor wire length for each sensor is 6m (19.6ft). If you require the sensor leads to be longer than 6 metres there is a small surcharge, please contact Engine Watchdog on 07-3277 6770 or go to our website.

Technical Information


The Engine Watchdog TM4 Twin Sensor Marine is an invaluable piece of equipment for your marine enbgines –

  • TM4 Twin Sensor Marine uses the most reliable monitoring method
    All engines radiate heat to their outer casing at a constant rate (air cooled engines depend on it).The TM4's electronic 'Easy Fit' heat sensor simply fits like a washer under any suitable bolt that is close to the cylinder head or engine block. Here it accurately monitors the engine metal temperatures and if overheating is detected for any reason, the TM4 alarms with an alarm light, loud buzzer and 'Stbd Hot' or 'Port Hot' message.
  • The TM4 Twin Sensor Marine tells you the exact temperature of both your engines
    Many factory fit gauges indicate normal after you cruise just a few nautical miles and then do not alter on even the hottest days. Obviously the temperatures of both engines are constantly altering as you travel at varying speeds and in varying conditions, yet the gauges are not responding. This is because they have a 'flat spot' around the normal mark and will not move until something is very wrong, often once it is too late. The TM4 Twin Sensor Marine has the sensitivity required to display every temperature change for both your engines as they occur and in an emergency will alert you before your existing console gauges have even moved.
  • You can program the TM4's alarm sensitivity to suit each engine
    With a TM4 Twin Sensor Marine you don't even need to know your engine's temperature specifications to set the overheating alarm. You simply note the highest temperatures your engines reach during normal cruising and then set the audible alarm to go off at a few degrees higher by pressing the button on the front. You get to set the alarm sensitivity for the starboard and port engines indendently, and it's no harder than setting an alarm clock.   If the alarm goes off while either engine is working hard, you can simply press the front button to stop the alarm, or give it another press to increase the alarm temperature for that particular engine.
  • The TM4 Twin Sensor Marine is very easy to fit
    TM4's can be fitted by any home handyman. The main unit fits under or inside the boat's dashboard (Compact size - 80 x 30 x 60 mm, plus mounting tabs). The 'Easy Fit' temperature sensors take a few seconds to fit, bolting one to each engine. The power just plugs into the cigarette lighter socket or it can be hard wired to your boat's electrical system. TM4 Twin Sensor Marine suits 12 or 24 volt systems.
    For pictures and more installation details go to: TM4 Installation Page
  • The TM4's sensor cannot cause coolant leaks, or void the engine's warranty
    The TM4 Twin Sensor Marine is perfectly safe to fit because it does not require you to break into the cooling system in any way.


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