Yan,
I'm installing an aircraft oil cooler with aircraft insulated hoses that will be custom made. I found this water and oil temp gauge on the internet. You can buy one or two probe sensors. The gauge can be set, it has an alarm that sounds when you reach your temp setting. Very small, has a big LED display...
Engine Temperature Alarm Dual Sensor Latest Technology Compact Display | eBay
Here's some pixs of my install: I did some surgery on the ashtray so it's hidden when not needed. This is the nicest compact unit I've found. The owner of the company is a car guy and we've become friends, albeit he's in Australia, I'm in Texas...
