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Old 08-18-2009, 09:00 AM
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Frisco Frisco is offline
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That housing is a stock GM housing. There was a temp sending unit installed there that controlled a vacuum switch.

Below are two photos from different angles of one that I have. There is a casting number on the housing. It is 336773 then about 1/4" gap and then the number 17.

Left click for a larger view.
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Last edited by Frisco; 08-18-2009 at 09:51 AM. Reason: added photos and casting number
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