So I finally visited Vicky today for the checkup. Sensors seem to be working; he checked some voltages, but after finding out there is no DCL port, he would work any further on the car 
How can i install DCL port in the wiring? Is it easily available? and from where? What would be the cost?
Further, I have EG6 cluster now which has CEL option. How to get that light working; I mean which wires need to be present and from where on ECU it will come to the cluster?
Would I need to change any wiring harness inside the car?