gas gauge inop. cluster illum. inop. courtesy lights inop. on 1996 Mercedes-Benz C220

fuel gauge does not work,move slightly on start-up ,then nothing. interior lights dont come on anytime. gauge cluster illumination lights dont come on anytime. all fuses are good.any leads on related relays and there locations, trouble shooting tips etc. would be greatly appressiated

Asked by for the 1996 Mercedes-Benz C220
seek a diag and est from a german repair shop