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Failing that, dynamite fixes everything

Use a BFH to dimple the floor board. I had to do that for the Atlas. You won't even notice it inside

The ECM does need to know when the vehicle is moving. It operates differently than when parked

Sounds like you are almost there

A wrecking yard may be your best bet.

Jeep calls it a Vehicle Speed Sensor in the FSM

Try this. Vehicle Speed Sensor

Speedometer drive I think. Look at a quadratec catalogue at the pic of the tcase exploded view. It will tell you what the proper name is

One piece component. Keep the little gear though

You just need the proper speedo sending unit. Instead of a cable it has a plug on it. It takes gears and inserts the same way into the tail housing. You calibrate it just like the cable version...