kodanja, why not use the new ones but change the rings. If the paint is bad, clean or strip them and paint satin black. Some are just a pain to get apart but a little careful prying of the little fingers they come away with a turn. The gaskets are probably shoot on both sets and most auto retailers have a large selection of "O" rings that will work. This will also allow you to clean the glass and the gauge. The paint on the gauge will be very fragile, so use only a fine artist brush to clean the face of dust. Wayne