ABS and 4matic lights not coming on……

I’m the happy owner of a 300TE 4matic with a Twin Turbo kit from Mosselman ,however I seem to have a problem with both the ABS and 4matic lights on the dash not coming on…..The ABS appears to work fine though and the triganle simable comes on and goes out as normal.
Please Any one got any good Ideas …