[Healeys] Instrument cases - plating

[john spaur]

I am wondering if the instrument cases are all zinc plated on a 1962 
BT7. The tachometer looks as if it is zinc but the lamp socket 
appears to be zinc with yellow chromate. Same for the securing clip 
although some of the other instrument clips appear to be zinc and 
some appear to be zinc with yellow chromate.

Anyone know what the finishes should be for each instrument and clip?

Thank you,
John Spaur
San Jose, CA