Installation into the gauge board of my motorhome was pretty straightforward. Finding the correct wiring for the gauge was a little more difficult in the many looms of factory wiring behind the dashboard. If you're installing this in a 40 ft or larger rear engine motorhome, 49 ft of wiring is barely enough to do the job. I recommend buying two 40 ft harnesses. You'll have a lot of leftover but you won't come up short.