what engine code?

Speed is from the sensor on the gearbox.  Could use an ABS sensor too.  RPM is from the Engine Speed sensor on the front of the block.

I don't understand what you want?

So connect the sensors from engine speed and vehicle speed?

They go into the ECU and they're converted from there.  The box you've bought takes the raw signal from the sensors and converts it itself.  So, go fine the Engine Speed sensor and the vehicle speed sensor and connect them to the box?

Not everything supports 60-2 wheels which is what most VAG stuff is.  Could use the gearbox sensor or an ABS sensor. 

Still unsure what you're looking for.  Maybe it's just me?

Just to be sure:
You also bought the Defi-Link ADVANCE Control Unit?

Your Seat will be wideband, so you can connect to the first lambda for wideband monitoring.  Just tap into the sensors, just as you will for engine speed and vehicle speed.

Your box should NOT be used to provide logging data, it should purely be there as eye-candy.  If you're mapping/logging on the road, use the ME7Logger software and leave the laptop connected.  Don't be stupid and attempt to monitor 20 variables on a tiny OLED screen while limiter bashing 3rd.  You'll kill yourself/someone/some family/kittens.

Personally, you should only have oil pressure, oil temp (if tracked), AFR and EGT as gauges, and they should be used as a quick visual check.