I have a 1997 Honda Civic VTI Automatic transmission with D15 B Dual V-TEC engine. My car was originally a VTI Automatic with stock single Vtec engine and Ecu.
I was in a similar situation and I have successfully installed a p2j Ecu for Automatic transmission
If your car was a VTI originally (auto antenna on left rear fender instead of front right pillar,5 Enkei Alloy rims,Vtec engine) your stock wiring will work great you just need to install two wires to the Ecu for the following things:
1: Second Vtec solenoid
D15b Dual Vtec has two solenoids and since your car has only one wire you need to install the wire from solenoid grip to correct ECU pinout.
2: Oxygen Sensor (o2 sensor)
You would need to get a hole made in your mainfold and install a single wire 02 sensor (costs 1000-1500 rupees) and a wire from sensor grip to correct Ecu pinout.
I got the above things done last year and the prices were
1: Ecu. I dont exactly remember but I guess 3000 after exchanging my one
2: O2 sensor for 1000 rupees each (I had to buy 2 because the one I bouht earlier was faulty
3: electrician should charge 1000-1500 max