Just for info. I might do it just for fun. Don't need it.
I'm with you, Ferris - it's all about the fun!!
And what the hell is 4377?? Reminds me of George Carlin, talking about words people use, to avoid other words:
Some people say "shoot" instead of "sh*t." They can't fool me, man. "Shoot" is "sh*t" with two o's.
Means the same thing.
As for wires, to screw up. This concept attached to nothing in the electrics or electronics of the bike. So, if it goes out, it goes out. Nothing else is affected. Rather like the light in your glove box - affects NOthing, when it's not working.
And, that's MY opinion...
Ferris - the link you posted gives the pdf's for etching the boards. I am set up for etching, and if you aren't, and want a set of boards, let me know, and I'll etch up a couple sets. Here's some I made recently, for some solid state relays:


And the finished home-etched and printed board:

Nice use of the ATTiny25 - I use them a bit, in the computerized christmas light show, and have the USBTiny programmer.
Let me know...
R