Engine temperature alarm

[shibbs]

A valuable lesson was learnt last year. A temperature gauge is all well and good if you can constantly keep an eye on it. I'd like to fit a buzzer or alarm to indicate of high temperature.
Can anyone recommend an alarm of some sort? Ideally i don't want to spend a fortune but really would like something. Are there stand alone kits or an easy option of DIY?

Any ideas or links would be great..

[Ianfs]

Something like this seems to be a good idea.

http://www.siliconmarine.com/sm007s.html