(T) Barchetta to Punto trip computer

I have a complete Barchetta engine / most of the loom and the ECU crated up in my shed.

I have a guy who wants to buy the whole to fit a Punto HGT with dud electrics..It had a small fire...with me so far?

Here is the question...How is the trip computer on a HGT driven..ie where is the cpu and the data takeoff? Presumably the Barchetta ECU has a trip computer fitted as its the same as an HGT unit ..just the Barchetta has no display unit?

I know the Barchetta / HGT engine is plug and play..how to make the dash display read the ECU?