Looks like it just sends a distorted signal to the ECU to trick it into thinking something else is happening. I would love to pull one apart to see whats happening but I guess its just a few resistors and a potentiometer on a PCB. Better just to spend some money and get a remap and have some real results. I bought a ZX 16v a few years ago with something similar installed. The guy I bought the car from told me it was an "adjustable tuner". I wasn't impressed with it and ended up disconnecting it.
If you want to play with the TPS on a Pajero for free, you can adjust the sensor on the back of the throttle body. Its either 1 or 2 Philips head screws, I don't remember, then you can rotate it forward or back and experiment to see what results you get. Mark the original position with a sharpie or tippex before you start playing so you can put it back to the original position if you aren't happy.
Here's a bonus pic of the ZX 16v, one of 500 sold in UK, only 5 remaining on the road. White ZX behind is a Volcane TD.
zx