I have the dubious honor of being the last to post a thread on the old board (concerning the tach install).
To refresh:
Got a tach kit for Christmas and everything progressed fine (mine is an 02 so I had to change out the console harness and add the wire, no big deal).
The instructions told me to 'locate the main harness instrument block and insert the free end of the cable into the top row of the connector block 3rd from the end' and even showed a pic of inside the headlight bucket.
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After continuing to search, I found a PDF from Tean Triumph (I think) stating that the wire from the ignitor goes into the empty hole in the CONSOLE connector block (3rd from the bloody end).
Did so and the tach is working like a champ!!
Phil