I was bummed that Kawi replaced the temp gauge with a fuel gauge for the new gens and was about to buy a Koso unit. After searching a bit I found this unit instead.
Temp Gauge
It actually has two channels so I bought a second temp probe so I could display both oil and water temps.
Probe
Drilled an extra oil plug and put it in place of the pre gen drain plug.
A 1/8 brass plug fits well in place of the stock over temp sensor.
After drilling the plugs, I glued in the probes with hi-temp epoxy.
Here is a shot of the gauge itself. You can set a couple of dip switches on the back to display the oil or the water temp or you can alternate between the two every 5 seconds or so. There is a light sensor on the face of the gauge so you can also switch between the two sensors by shining a flashlight on the display.
We will see how well it holds up but the quality looks better than your standard Chinese fare. For less than $20 I took a chance.