Can some one tell me what the color (number RGB) is of the MCP of a Boeing 737-400 ???

Wha? Do you mean the 'plate'?

Yep I mean the plate

Well since it isn't a totally 'flat' color you'll have to add noise. Try something around 100/100/100. I had a look at the color from some real photos.Regards :-wavehttp://flightsimmers.net/airport/etti/signature_pro.jpg