I just installed the Koso mentioned above, last week. I love love love it. I wanted an analog gauge to match the outdated stock speedometer on the TW. It matches fairly well. The blue light stands out quite a bit at night, it's easy to look down in a flash and catch your RPM. I wish the shift light was slightly brighter. It's hard for me to see using peripheral vision.
The install took me about 2 hours, and thats including soldering and heat shrink tube wrapping the connections.
Thanks to Novaks44 for the following info:
"I recently bought a Koso tachometer for my TW. It's model number BA481B17, and can be had from DennisKirk.com, for $108 and free shipping, which is much cheaper than other places charge for lesser tachs. I like it because it's small, but easy to read, and has a shift light, which I doubt I'll use much, but it's neat just the same. The install was pretty easy. First, I tried to wrap one of the wires it comes with around the plug wire. That did work somewhat, but the readings were erratic, and less than ideal. I then tried the other wire it comes with(type B as they call it), and installed it between the ignition coil and the orange wire that plugs into it. And that, is the way to do it! Perfect, accurate readings! I compared my results to the online gearing calculator for our T'dubs, and it appears to be dead on. The only other wiring, is battery positive, ground, and a switched 12V lead. Simple!"
he also posted
"Another installation note I forgot to mention. When setting up the tach, there are two steps. First, choose the cylinder/cycle mode. The instructions are not very clear on this. Just set it up as their example, so that the needle is pointing at the 2 during this step. Next, you choose the "mode". There's two : Mode 1, and Mode 0. Choose Mode 0(needle pointing at zero), and it'll work correctly. You can check out the instructions on Koso's site, they're in .pdf format. If anyone else gets this gauge, and needs help, let me know! "
Those tips really helped me, because the instruction manual is very vague.
I found a dyno chart someone posted that listed the TW200. Here it is:
dyno chart
According to that, I would program the shift light for around 7800 if I was doing performance riding/pushing it hard. I currently have the shift light set at 7grand for when I want to get on the throttle.