Drams

Good afternoon all. I imported my car over from USA, second one, first was a stage 1 touch. This is my 07 chip foose designed stang. It needs 3 phase front lights with left dip installed. A side indicator installed on both sides!! New cluster on back to replace all red, which I accept but the fog lights never existed before on my cluster AND THIS IS MY PROBLEM. My auto electrician says when he wires it up the brake light flashes as if it's an indicator and that it needs a specialist who can play around with ECU. I find this very hard to believe, so.....ANYONE out there shed some light on this situation yo install back cluster. Not a happy stranger right now.
Cheers ye all.
Andrew.