The PossumLink Engine Management computer was developed jointly by Possum Bourne Motorsport and

LINK ELECTROSYSTEMS LTD:
243d Annex Rd, Sockburn, PO Box 9166, Christchurch, New Zealand. Fax +64 3 348-1595 ....Ph.+64 3 348-8854.

They should be able to give you more info about it.

(list 6284, S/N 00299, 4 gig blue)
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)