I believe in 2004 they changed the clusters quite a bit, however I'm not sure if the gear indicator's cable changed with it. On 03 and earlier rangers, you had a small white block on the bottom of the steering column held on by a single bolt. I forget what size, but it's fairly small. Imperial size, I remember that much.
You loosened that then with a pair of needle nose pliers, you lifted the actual cable off the metal 'hook' that pulled it. Was easiest to do in gear 1.
Whether or not this has been changed in 04 I do not know, but it may still apply.