Sorry Be3k, I haven't looked at this in a while, didn't think I had any replies.
Mine is a 5 speed so no indicator to worry with.
I checked back here today because I fixed mine this PM and wanted to post in case anyone else had the problem. I first thought the little driver motor was bad and luckily had no luck finding a replacement so I just took mine apart again hoping moving the gear would work.
Evidently I had pushed the gear on the shaft too far. I eased it up a little, about 1/16th of an inch. Now it works fine.
I don't know what may be different on your truck from mine but I also found it easier to remove this time as I didn't really have to do everything on the tutorial I was using.
Here is a thought. The first time I took mine out, once I had access to the cluster, before removing it, I took the 7 screws out of the cover first. It was a little tricky but I did it. (if you are using the same tutorial, step 6 is where you can do this) They are torx screws. At this point you should be able to pry out the 3 clusters (if like mine), first the right and left sides, then the middle where the speedometer is located. They simply unplug. This is where you find the little odometer motor and it removes by twisting clockwise, lifting out and you will see the gear that needs replacing. Maybe this way you don't have to unhook your indicator.
However, there must be a way to disconnect it, someone will show you, just keep looking. Hope this helps.
Oh, and I only replaced the gear for my odometer. No need to fool with the speedometer so don't worry about calibrating if your only problem is odometer.
