clio 2.0 sport 172
fitted a new headunit in my clio 172 and discovered the speedo wasnt working so took it back to renault and found it had blown the abs sensor i guess its the ecu basically which has cost £2000 to get sorted i have been told its all to do with the multiplex wiring in these cars been told to run the headunit from the cigarette lighter is this true and what do i need to do?