I got a scangauge2 which incoperates an OBD2 reader, it also has a trip computer or you can run 4 additional gauges such as air intake temp and an accurate coolant temp or one that shows available power as a percentage.
I have it permantly running in my ZS180.
Unfortunatly I don't think my mk1 F VVC is OBD2.
Home to black Alfa Romeo 159 3.2 V6 Q4 ,green MGF VVC and red MG Maestro T16.
MG - the friendly marque.