I am providing u some genaral information about cng connection,
1 - Red wire to connect with any positive terminal operated by ignition switch.
2 - Black wire to connect with any ground (-ve) terminal.
3 - Brown wire to connect with -ve terminal of ignition coil.
4 - Yellow wire to connect with petrol stop solenoid valve.( Installed between fuel pump& carburetor)
5 - Blue wire to connect with Cng solenoid valve attached with regulator or kit.
6 - White wire to connect with cng level sensor attached with regulator on the top side.