A few years ago I purchased a parts collection from a family who's husband/father specialized in speedometer and cruise control work. His health declined quickly so I wasn't able to ask him about some of the parts I purchased. Today I came across a box with several of these in it. When I did an internet search it came up on ebay as a generic GM Transducer Valve. The part number stamped into it is DR495. Does anyone know if Oldsmobile used this part? If so, what years/models? John