Digger:
I did get a very basic tech data sheet, and a dimensioned drawing, but no real installation instructions. I have it working now and it is great. Here's what I did.
Fortunately, the wiring is really simple. I placed the LCD unit on the left side handlebars at the mirror mount. Just run the positive lead down along the existing wiring harness to the spark plug wire, give it about 3-5 tight wraps around the outside of the plug wire, and then wrap electrical tape around the wraps to hold it tight. Take the other wire and run it to the battery negative or some convenient ground point.
Sounds easy,but it's the access that is a pain. I first tried to see if I could get a couple good wraps on the plug wire by reaching under the gas tank with my skinny fingers. Then I pulled the plug wire out and of course I was able to wrap it nicely, but then I could not get the darn plug wire re-seated on the spark plug. So I took off the seat, gas tank..you know the drill.
Anyway, this allowed me to do a better job of running the wires. Soon as I had it all back together it fired right up and worked like a charm. I have it taped in place as I have not decided how I will permanently attach it to the handlebars.
Incidentally, I went for a one hour ride in an area you probably know very well. Headed up to Titusville, thru the KSC complex area, past the Astronaut Hall of fame, the VAB, back thru Merritt Island, then US1 back to Melbourne.
Good luck with the install. Worth every penny of the $25 to have accurate RPMs and an hour meter.