Jamie
I use a HW 60a speedo in my 2wd and have used it in my 4wd to good effect and with no problems.
However it is the sensored V2 (or 2.1) that I suggest you try and stretch to. The one in your link is the unsensored version and is unable to run the different boosted software versions you might like to use with an 8.5t.
If I was buying on a budget I would take a look on ebay at the Bullistorm (HW copies) which are inexpensive.
I have just bought one as a back up and they seem like good value.
Pip
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