Here is the recipe for making an Audi GTB electronic conversion board:
https://www.pololu.com/product/1394
1J0973733
1J0973833
1J0973722
8d0973822
Jeep: 68087939aa - or use the VW equivalent which is preferred. Jeep connector is cheaper AND comes with wires, a piece needs to be removed for it to fit.
I don't have all the components in front of me to give you exact wiring but here is how it works.
N75 plug, one wire is +battery(T2/1), one wire is 0-12v signal(T2/2) from the ECU, a PWM signal. Add a ground wire to chassis.
+12v batt goes to VIN, the added ground goes to GND.
Put a fooler resistor(1k IIRC) across the two N75 wires so that the ECU is happy
Make up a voltage divider circuit to turn the 0-12v signal to 0-4.5v, that goes to the RX signal. .47v/v is what I used.
The 2x3 header on the JRK has a 5v output, groud, then feedback input - these go to the turbo connector, it has a 0-5v position sensor in it.
feedback: T6/4
+5v: T6/5
gnd T6/3
A and B on the JRK also goes to the turbo - this goes to the motor leads on the servo. Pins 1 and 2
From there, you get to play with the software, I don't know where my settings would be saved.