Probably the easiest way is to get an OEM kit. Ask your local dealer if they stock P/N 0639-985. I'm guessing they'll probably be around 100-120 USD. Many of those P/N's were specific to certain years, but is basically the same kit. Ask your dealer. I would put it in the stock "fuel guage" location between the speedo and tach, just a bit higher than centerline, where you'd find it on a '98 Panthera 8.
And yeah, I'm all for guages, too!!
Idiot lights are for.....