[LH Lead-Foot]

With a complete matching package from donor vehicle with PCM, the Tremec TR6060 will have a two wire high resolution VSS sensor that is wired directly into the PCM. The VSS sensor signal is split into several outputs depending on the vehicle it came from.
The PCM see's an A/C signal coming from a permanent magnet generator type VSS sensor and changes it into a a D/C signal. While calling one wire VSS High, the other VSS Low, it make no difference. It take the signal and sends it to the dash on a class 2 single wire network. It is shared with ABS brakes on many models for rear wheel speed, but also for the radio so the volume level changes with speed and road noise.
In your case, the VSS signal between the trans sensor & PCM can be spliced into and sent to the Dakota Digital Dash if instructions or customer service says it will work that way. Just supply a good ground wire, twisted with the other two wires and I like to cover it with foil tape, but ground on each end for reducing induced radio frequency interference, creating a clean signal. GM does it factory.

Note; Place wires into a vise, and the other end in a drill...pull tight, turn drill on and walk towards the vise as they twist together.

The coolant temp sensor and oil pressure sensor from Dakota Digital can be install using metric threaded adaptors for $20 on eBay (Item # 262521228458) that replaces the stock oil pressure sender in the same location, but installs the coolant temp sensor into the passenger rear head location, opposite of the OEM temp sensor the PCM needs to see for fuel, timing and idle speed.
These adaptors are quality brass alloy with a soft aluminum gasket which allows for ground thru the sensor body. The OEM oil pressure sensor uses the same socket that fits idiot light switches back to the 60's.
As I said earlier, the OEM oil signal is a "Pass-Thru" the PCM, via class2 into the dash.
Also, you have to wire the PCM's reverse lock-out circuit into the TR6060 (Called Reverse Inhibit solenoid) has two wires, 1 hot with key, the other is LT GRN to the PCM, to allow reverse shifting below 5 MPH. It's part of the package.
They also employ a Clutch pedal position switch, hot with key, open with clutch pedal depressed, into the PCM for keeping you from making a Boo-Boo when starting.
Yes, you can purchase several different aftermarket modules, like the Dakota Digitals BIM-01-2 for $100, but why if you don't need it. The coolant & oil sensors are one wire each and should be wired into a 10 or 12 way connector behind the dash as found on many 20 year old GM's sitting in the bone yard. Just cut them off leaving a few inches of wire on both male & female side, then solder, shrink tube them into place.
Call Dakota Digital's customer service after reading the instructions, but have the model number ready to get it right. A $100 bucks here, a $100 there...and soon you have enough to fill the gas tank with high octane a couple of times.