right at the moment i dont have the money to buy a new temp meter to replace my old one so i was woundering if there is a simple way to give a rough indication of engine temp, i'm gussing someone should know as digital temp meters hadnt really been widly used up till a few years ago, i remeber somthing about puting a little bit of water on the head and timing how long it took to go

any help will be much appricated