Or if your car has an under-dash OBD-2 DLC, you can spend about P7k and get more readings/measurements in one box using the ScanGaugeII (SGII).

That's what I did: The "cWT" label is the Water Temp in Celsius

[ame="http://www.youtube.com/watch?v=5YRNPHuQMps"]YouTube - ScanGaugeII on my 8th Gen Civic FD[/ame]

[ame="http://www.youtube.com/watch?v=vDQb15wQxv0"]YouTube - Digital gauges on ScanGaugeII[/ame]

More about the SGII here: www.scangauge.com