((( Audible))) Engine Temperature & Low Oil Pressure Alarm

Ideal engine protection for all moving vehicles

Air or water cooled

3 MODELS AVAILABLE for Cars, Trucks, Boats, Bikes, Tractors & Machinery (see below)

Just released! The single sensor TM4 now also records the highest engine temperature reached.

The TM4 accurately displays engine temperature and alarms with a Warning light, Loud buzzer & Display messages if engine overheating or low oil pressure is detected.

Plus the TM4 can control a Cooling Fan Relay see over

The TM4 is ideal for alarming Engines, Gear boxes, Transmissions, Transfer boxes, Pumps, in fact any thing that operates between 1 to 125 degrees Celsius (33 to 255 F - see TM2F in options).

Display Functions and Alarm Messages:

The TM4 has a white LCD screen with an automatic back light so it blends into both old and new dash boards alike. It is easy to read in either bright sunshine or at night. All functions and alarms on the TM4 are accompanied by individual display messages so you are never in doubt as to what's going on. The TM4 has up to 14 different display messages, including advanced messages such as 'Sensor Not Connected' should the sensor cable be cut.

Temperature Warning Alarm:

The Engine Watchdog TM4 offers the best all round early warning engine overheating protection available. The TM4's advanced electronic 'EASY FIT' heat sensor monitors the actual metal temperature of the engine, this way ALL causes of overheating are quickly detected before damage can occur.

The sensor fits like a washer under any convenient bolt on the engine that is near the heat source, here it rapidly detects the slightest changes in engine temperature. The TM4's warning alarm sensitivity can be set to suit your individual engine and needs.

The alarm is set by firstly observing the engines highest normal running temperature on the TM4's monitor. Then the alarm is set to a higher temperature by using the push button on the front. Typically the alarm is set to between 5 and 10 degrees above the engines normal running temperature, this usually equates to the warning buzzer sounding at just one or two needle widths above the normal mark on most car temperature gauges.

Because you're not breaking into the cooling system, the TM4 is the quickest, easiest and safest system on the market. The TM4 will not void engine warranty and can be easily fitted by a home handyman.

Oil Light Warning Alarm:

The TM4 can turn a vehicles oil light into an Audible Oil alarm. By connecting the TM4's oil wire to the existing oil light sender, whenever the oil light comes on the alarm will sound and the 'Low Oil' message will display. When starting the engine the TM4 will display 'Alarm Delay On', this gives the driver 10 seconds to start the engine before the oil alarm is activated (if the oil wire is not connected to the oil sender the above messages & alarms will not be apparent).

NOTE This feature is not compatible with oil gauge sensors. If you only have a oil gauge and want the oil alarm feature, fit an inexpensive oil light sender to the engine - Standard car type - normally closed contacts, open on pressure. Further Note If you only have an oil gauge. Oil system faults can cause abnormal heat build up in engines, this overheating is often detected by the TM4 .


1. General purpose single sensor TM4 Single heat sensor version for monitoring the Engine temperature, Low Oil Pressure and controlling an optional Cooling Fan Relay.


2. Twin sensor TM4 model for vehicles monitors and alarms both the Engine and Transmission temperatures at the same time, order model TM4-Twin-Vehicle. (Cooling Fan option not available)


3. Twin sensor TM4 model for boats monitors the Port and Starboard engine Temperatures at the same time. This model displays 'PORT' temperatures on the top line and 'STBD' on the second order TM4-Twin-Marine Note the TM4-Twin-Marine has one oil input that is connected to the port engine, thus this feature is not usually used on two motor installations (Cooling Fan option also not available).


4. Customized wording for the TM4-Twin. The display messages on the TM4 twin models can be customized to your needs for a small charge (maximum of 4 characters per line including spaces, example Auto on the top line for Automatic gear box & T/C on the second line for Transfer case).


US. & Canadian Customers - Fahrenheit readout is available, see Specifications and choose Model TM4F when ordering.


General purpose single sensor TM4 AU $164.00 includes the 'Easy Fit' heat sensor, internal buzzer, automatic back light, cigarette lighter power plug, under dash lid, installation kit, water resistant front, provision for optional cooling fan relay & FREE postage World wide.

TM4 has a number of free options, see the side bar for FREE OPTIONS .












Optional Extras See Pricing

Cooling Fan Over-ride relay kit: For an extra $20 a relay can be fitted to control a cooling fan. Both the ON & OFF temps can be set anywhere from 1-127 degrees C. (Fahrenheit version - 33-255 F in 2 degree increments). The Fan temperature settings are fully independent from the main alarm temperature setting. It has 3m (10ft) of cable between the TM4 and the relay. This relay kit can be purchased later as a separate plug-in item for $30. NOTE: COOLING FAN RELAY KITS ARE NOT COMPATABLE WITH TM4 TWIN SENSOR VERSIONS.

Mini Sirens: For an extra $20 a very loud mini siren can be fitted. These sirens are ear piercing when close up, but can be subdued by placing tape over the aperture. NOTE The siren is fitted to the 'external buzzer output lead shown in Free Options


Fahrenheit Version Unit: Reads in two degree increments from 34 to 255 degrees F. CLICK 'TM4F' ON ORDER PAGE

Longer sensor leads are available for boats & machinery: For the single sensor model lengths up to 10 metres (30ft) are free. For the twin sensor models lengths up to 6 metres (20ft) are free. A small charge apply's for sensor leads over these lengths. SPECIFY LENGTH REQUIRED ON ORDER PAGE

Water Resistant front: Standard on all TM4 models

External Alarm Output lead: The TM4 alarms using an internal buzzer. The voltage that drives this buzzer can also drive an inexpensive 12v horn/spotlight relay for turning on flashing lights & other warning devices.( NOTE the internal buzzer and relay come on together) IF REQUIRED, CLICK 'BUZZER OUTPUT LEADS' & THE LENGTH REQUIRED

Lid without mounting tabs. Standard units come with 12mm tabs on the sides for under dash mounting. If you want straight edges so you can stick the unit down onto the dash, IF REQUIRED CLICK 'LID WITHOUT MOUNTING TABS' WHEN ORDERING



Compact Size: Face is W 82 mm x H 30 mm. Depth back is 60 mm. A standard lid with mounting tabs adds 12 mm to each end. A lid with No mounting tabs is available , see above in FREE OPTIONS

Max operating Temp: 127 degrees Celsius or 255 Fahrenheit. Fahrenheit version is available, see above in FREE OPTIONS

Alarm Temp: Adjustable by pressing the front push button. Can be set to alarm at any temperature between 1 to 127 degrees Celsius. (TM2F is adjustable from 34 to 255 degrees Fahrenheit in two degree increments)

Alarm Volume: Internal alarm 85db, plenty for most situations. Very loud external mini sirens are available at EXTRA COST. See Extra Options above.

Sensor wire length: 4m (12ft) Longer leads are available for boats and machinery, see above in FREE OPTIONS.

Power: Suits 12 or 24 volt systems. Current consumption without alarms on is 15mA.