I picked up two of these for my two tanks on my OFF-ROAD POPUP trailer... Both gauges jumped to full green when I turned on the tanks...
![](http://www.thegreenhead.com/imgs/gaswatch-propane-gauge-1.jpg)
I was thinking this is going to be great... SO I started my usual camping runs and everytime I would look at them they both read green...
I would feel the tanks the first thing in the morning and I could see the one I was using was showing the liquid line dropping and when it finally got to half a tank I noticed the gauge was still showing full. I continued on using it until it was about 1/8 full and finally switched over to the full side...
I never did see the gauge show anything except full haha...
The sweat line in the mornings has always been my measure of how much liquid I have in my tanks...
Sure glad those gauges didn't cost very much...
One thing I do here is I have one of those D-RINGS and I move this to the side I am using to tell me which tank I am on. Helps me keep track... One guy told me it was better for him to do the same thing but he would hang it on the empty tank haha...
Roy Ken