I forgot to add- for some reason previous owner welded the gear oil fill plug so I had to remove the speed sensor at the back of the trans to get the new stuff in. (Another lesson learned: before you drain the old oil you should check the fill plug is in working order). This way was a bit more of a pain on a 98 because of all the extra crap above the area but not too bad.
You unclip the electrical connection (its kind of weird with a bracket but it pulls off) and then reach back there with a socket and extension/swivel to remove the 1 bolt 10mm and then the speedo kind of twists out:
Then get a long funnel of one with a flexible hose - I can't find mine so I had to improvise this way and pour in the new fluid and replace the sensor, nut and reconnect harness.