VESPA GTS Super 125 i.e. Service Station Manual page 130

Injection
28. Not connected
29. Engine speed sensor positive (Red)
30. Not connected
31. Lambda probe heater (White)
32. Not connected
33. Low beam lights automatic ignition enabling (White-Black)
34. Fuel injector (Red-Yellow)
EMS circuit diagram
1. Battery 12V - 12 Ah
2. Rpm sensor
INJEC - 130
Vespa GTS Super 125 i.e.