How hard was the installation?
I accidentally ordered my oiler without the P-clips (the metal band covered in rubber you see in the pictures, basically a conduit or cable clamp) so I had to go get some from the local home destruction store. If you ask, they include them for free and I forgot to ask. I also picked up longer stainless steel hex key bolts to allow me to mount the oiler to the back of the existing peg mount. No drilling, tapping or anything like that required.
If you have a bike with round stanchions out back, you could get away with zip-tying it to those frame members as demonstrated in the Tutoro gallery. I didn't have that option, so I tried the footpeg rather than the other ubiquitous install which is behind the license plate. At that, I just needed a 10mm socket, associated ratchet, hex key for the stock and replacement bolts, and that was all the tools required for my special install. The rest is all zipties (included), which is all the installation method would be for a more traditionally framed bike (no tools required in that case.)
The hardest part of it was deciding where to route the hose, followed by getting the oil nozzles properly oriented and finally discovering how many turns of the knob equaled 1 pair of drips per minute (about 1.3 or so for my setup) per the instructions. Actually, getting the metering right was what took the longest time; it was physically installed in less than 20 minutes and took a little more than 20 to determine flow rates.
Edit: Part 1 of the full review and install write up is
over here.
Edit 2: Technically, I have now made my bike British, as it now leaks oil (albeit in a controlled manner to lubricate the chain.)
However, unlike a real BritBike, I can turn the leak off and continue to ride without issue.