Your best best is to ask APT or Power Engineering how much for a drive in, drive out Omex engine management conversion and tell them what features you want from the ECU (anti lag, closed loop boost or fueling control etc).

Then ring Jano for a Cossie management conversion as above.

Then ring Mark at MAD about an Autronics conversion.

Etc etc. Then make your descision.

Don't forget mapping as well.