David,
Will take some pics tonight and post up. I think the transducer should still work if only partly lined up as you are trying to create a pulsing effect (due to magnets) that sends the signal to the speedo. As long as the transducer can pick up from the daisy wheel you should be OK.
I remember having problems trying to get mine aligned and if memory serves correct, mine is aligned almost to the edge of the wheel. Will confirm with some pics later.
Yes, my car is in a gel coat finish. To tidy up the edges around the boot and bonnet I simply used a felt tip pen of similar colour. I do have some gel coat to match my car but have not yet used any as I'm pleased with the general appearance. I'm thinking of either upgrading the engine or having the car painted later this year, but for now I'm simply enjoying driving it around. What fun!
Tony B
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http://homepage.ntlworld.com/tony.breski