Hi steven, thanks i have got that but its the engine warning light in instrument cluster that is not working need to identify pin supplying feed on ECU.Answer: Pin 8.
Pins 87 + 88 (+ground G131) are data lines for "T1" diagnostic test, i.e. the 3-pin "Fiat" style plug that is used to connect to the Fiat-Lancia Tester. T1 is hidden under carpet in right hand side footwell, high up, usually tucked away so you can't reach it unless you undo some of the tunnel carpet. (attached picture shows T1 and T11)