The new Ford Mustang’s colour changing instrument panel has made a Los Angeles engineer see red, claiming he invented the technology. Frank Weyer has filed a lawsuit demanding royalties from Ford Motor Co. for using a feature in 2005 Mustangs that permits operators to change the background colour of their car’s instruments, reports the Chicago Tribune. It says the engineer filed the suit in U.S. District Court in Los Angeles, claiming he patented the technology in 1999. His claim says that he wants Ford to pay $4 U.S. for each car that carries the feature, which Ford calls MyColor. Ford claims lawsuit is without merit because it bought the colour-changing system from Delphi Corp.