speedometer problem

91 xj 4.0 auto trans 242 xcase
I've replaced the speed sensor, the wiring for it from the sensor to the main loom in the engine compartment, and now the instrument cluster. The speedo STILL works occasionally :explosion . Does anyone have an idea what I can do next? Where is the ground location from the plug for the instrument cluster? That's all I can think of. All other gauges work fine.
Thanks

Have you checked the speedo drive gear? There is a cable for the speedo that enters the driver-side of the trans with a bolt to hold the plug in. Pull it out and see if there are any teeth left. There are pics somewhere showing this. I had to change gears to make mine more accurate after an axle swap by a PO.

You also have to rotate the housing of the VSS till the gear inside the trans is aligned with the one on the VSS.

Thanks, I'll be working on it this weekend. I can check it out then.
I haven't rotated the housing at all, just swapped out the sensors. Hopefully this means a new gear and done.
Anyone know if the gears are different between a 231 and a 242?