Don't mess with the dash loom. you dont have to.... just buy an ek4/9 engine loom according to which year your civic is. If your civic is a 1996-1998 buy an OBD2A engine loom , if your civic is a facelift 1999-2000 model, buy an OBD2B engine loom. B18C6 ECUs are all OBD2A so it will be plug and...