Had the opportunity to upgrade from the old fan instrument on a 2006 Viano to the Hi-line two dials. Everybody said its easy simply swap them except it isn't. The plug on the Viano will not fit the socket on the Hi-line. Both have 18 pins and superficially they would appear to fit but offer them up and the keys on the plug are wider apart than those on the socket. Any easy solution or is it a non-starter?