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Looking at the instructions it does look like you will need a digital speed input. You will likely need a pass through digital adapter, not sure which one, again hopefully someone will chime in. Maybe this one...

The 6L80 actually has a TCM built into the valve body, it has a speed sensor internal to the transmission, the TCI controller actually just takes the place of the ECM which had the inputs for RPM and TPS to manage the engine and communicated with the TCM, totally different animals.

My controller is completely different but there are some folks on here that have used the EZ-TCU, hopefully they can be of some assistance. All the TCI for the 6L80 needed was an RPM and a TPS signal, have you played with the TPS settings?

If your controller is programmable the crank sensor on that engine gives 4 pulses per crank revolution.

Basically this is what you have. But again you do not want to ground the "return" lead at the engine, it should be the same location the EZ controller is grounded or you can damage the controller with voltage spikes. It is best on all sensor wiring to use twisted pair to reduce noise caused...

It should not.

One of the two leads must be grounded or the controller will not see any signal on the other lead, you should use twisted pair wires and ground the lead at the same place the controller is grounded. There are different types of crank sensors but the HMMWV one did work with my TCI controller on...