Coolant level sensor kit?

[brisvr4]

Hey guys,
After my radiator cap blew off yesterday I realised that if there is a sudden loss of coolant the temp gauge will not rise as it is no longer immersed in coolant. In fact it could drop and the first we would know of a lost engine is when it stops!
Does anyone know of a decent priced coolant sensor that can be fitted into the radiator to detect when there is a loss of coolant?
I found this kit but am not 100% certain that it is what I'm looking for.
http://cgi.ebay.com/ebaymotors/NEW-...879QQitemZ220465793145QQptZRaceQ5fCarQ5fParts

 

[DOUGMO]

all rotaries ie; rx2 3 4 5 7 etc run a low level light in the top of the radiator tim.

It just shows a light on the dash to let you know when the top tank is no longer full.

pretty bloody handy

 

[brisvr4]

Is there a controller for it George or does it use the coolant a a ground or something along those lines?

 

[DOUGMO]

Im not 100% but I believe it uses the coolant as a ground.

 

[CLuTZ]

What about a water press gauge? Do they even make them?

 

[rob323]

I believe that a better idea is the block/head temperature alarms. Pretty sure they are on ebay for about $180. Seriously thinking about one for the rally car.

 

[brisvr4]

Ahhh, is that the one with the digital readout Rob?

 

[rob323]

Yep, and it's gotten cheaper too.
http://cgi.ebay.com.au/ENGINE-WATCHDOG-TM2-COOLANT-TEMP-SENSOR-GAUGE-ALARM_W0QQitemZ130379288287QQcmdZViewItemQQptZAU_Car_Parts_Accessories?hash=item1e5b360edf

 

[Missile]

I have installed something like this in a mates Patrol - we were lucky enough to source a propriety item which plugged into existing lugs. It was pretty cheap (no flashy digital readouts) and was basically an alarm which sounded and flashed.