vapor computer tach wire

wut up guys.installin a trail tech and wondering where best place to install tach wire.to the coil or wrap around the plug wire?if coil,wut wire to tap in to?any info is greatly appreciated.thanx

Wrap around the plug' wire, in the middle between coil & plug-cap.
According to Vapor you may T-off into the system, but you're on your own here!
If something goes wrong your bike may not run, and this cannot happen if you simply wrap it around - hence electrically insulated, it just picks up a little induction (kinda magnetic).
"Tune" the Vapor by deminishing/adding wraps as per the manual, it'll work.

Burp,thank you very much!Gonna go that route.Didnt know which was better or more accurate.

I did mine the same way but had about 12 wraps around the coil wire. When I fired up my pig it was off the charts....So I took off 7 wraps and did 5 like the manual said. Same thing....off the charts, I eventually realized I had the tach wire switched with the temp gauge ? It was the only other one that I could have switched, anyway it works fine now. I tried using the method the manual suggests for calibrating the speedo. Never even came close. I took about 20 rides down the edge of a tomatoe field with my GPS and adjusted the numbers until it was exact, now it is really an accurate tool, it seems the default numbers for wheel diameter are off a bit in the manual, at least for me.