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Front is TISS, rear is TOSS. That may or may not work as post 1998 models use integration between the engine and transmission via controller area network bus (CAN buss). Beyond my pay grade to know specifics.

The stock 4L80 transmission has the input speed sensor on the forward clutch. I have heard of some transmission where it is moved to the pump. The pump is driven off the torque converter shell so it is the same as the engine speed. I know TCI controllers need engine speed sensor.

DSL-1E. It has been replaced by a combination module that also supports speedometer systems.

The output of the Dakota digital tach module is a square wave, identical to that of a breaker point ignition V8 operating at the same speed.

I traced this wire to inside the cab, branching off to connect to the Dakota Digital module for the tach signal. I forget where under the dash..

No need to cut it off, just unplug and tie off. This terminal is provides an alternating current signal for the test port under the dash by where the civi radio would be. As Barrman stated, for the STE-ICE diagnostic tool. The only wires necessary for charge are the two wire plug and the...

Certain transmission control modules use both engine tach and transmission input shaft speed differential to delay torque converter lock up when there is slip in the converter. If the engine tach signal is not calibrated correctly, it can prevent TC lock up or create harsh lockup.

My finger is pointing to the terminal that is for the tach module buffer. It is a snap on boot. Driver side alternator. This is an alternating current with frequency proportional to engine RPM. The Dakota Digital module will convert this to a tach level signal of pulses per revolution which...

Stock CUCV alternators have a tach signal connection. Depending on transmission control module, you may need signal conditioning. Dakota Digital has a module for this purpose.