Technical Oil pressure switch wires

[Fiatnewby]

Hi all,
Can somebody point me in the right direction. I am looking for the wires that connect to the oil pressure switch on the engine. I can't find any loose wires. What colour are they? When I start the car it comes up with an error that there is an engine fault. I assume it's because of the ECU not getting a reading from the oil pressure sensor. The speedometer isn't working either. I checked the ABS pump, it has power, checked the sensors, they seem fine. I have a CAN error message that I can't erase. Unable to connect to the ABS because I am using an ELM cable with MES.

Thank you for the help.

 

[Fiatnewby]

Sorry, it's a 04 1.6 16v.

 

[Davren]

According to the eLearn workshop manual, the oil pressure switch has a single brown wire that goes to the engine management ECU.
.

 

[Fiatnewby]

According to the eLearn workshop manual, the oil pressure switch has a single brown wire that goes to the engine management ECU.
.

Thank you. I will have a look and see what I can find. I noticed there is a funny looking brown write.