AlexLSX7

I have just done some testing on my Dell laptop which only has 2 USB ports. One is USB 3 (Blue) and the other is USB 2 (Black). I have been using the left USB 3 port as it was easier to plug in while in the car. I swapped it over to the USB 2 port on the other side and i now no longer have any lag what so ever in the software. It was really bad before,.
I have found this the case many times in Windows 7 and Windows 10. A lot of devices just dont work well in a USB 3 port unless they are USB 3 themselves. Most likely a driver issue.
Check your laptops and see which port you are using as it may be the same case for you too.

You'll need to check the wiring in your own car to determine how its wired up. Its likely gearbox > dakota > dash + ecu, but you can set these things up many different ways.  Is it the factory dash? the link acceptable input range is in the same ballpark as what most 90's dash's expected, and that TR6060 probably outputs a much higher frequency being quite a new gearbox, so i'd guess the dakota box is used to drop the frequency to something the dash and ecu can both use. Conveniently, most 90's japanse cars used the same number of pulses per km for their dashes, so you can probably just splice into the dash+ecu speed signal and run an additional wire to the speed input on the steering ecu.
Get out your multimeter and figure out which wires connect to where so you can be certain.
You've got 3x options
1) use the link as a frequency converter and run a new speed output wire from link > steering ecu
2) connect from one of the dakota outputs to the steering ecu
3) if youve already got the right frequency running into your dash you can add a wire to this so its connects to the steering ecu as well.
 
Only #1 will give you personalisable control over the level of assist. The other 2 will both take the real speed and feed it to the steering ecu so it will follow the factory speed vs assist calibration. 

You will need to go live with the ECU and set the cylinder count to 8. If you are then on direct spark and sequential fuel it will force the drives to the correct settings.
In the map you are working on it was form a 6 cylinder application and so those drives were free to be used for other functions.
 

Just in case you dont yet have a live ECU to connect to, attached is a Xtreme Base map that I have loaded into a ecu and enabled all 8 ign/inj drives.  I have also turned off some of the irrelevant stuff like gear shift control and VVT etc.
G4+ Xtreme Black V8 Sample.pclr