Finally I think this can be finished. The pulleys came off both the old and new alternators with the rattle gun - I only needed to hold the pulley by a gloved hand.
So the original larger pulley (and spacer) are now fitted to the new Hella alternator - and the tacho reads correctly again!!
I am back to the 7PK1595 belt.
I do have a surplus Dayco 7PK1580 belt - it's done about 7,000klms - free to anyone in Cairns. (According to the Dayco Application Guide it suits Diesel Defender Jan 1994 to March 1999; or Diesel Discovery January 1996 to March 1999.) Just send a PM - not sure how I receive those but I guess I'll work it out!
Thanks for all your help with this!
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