Pretty popular DIY combo for controlling a two speed electric fan, Volvo relay #1398845 and BMW temp sender. Lots of info in the 'net for how to hook one up. I put it together for a SBC build that never happened. The Volvo relay is a used unit, but the temp sender and plug are brand new. Also includes 1/2NPT bushing tapped for the 14mm BMW thread.
anyway, $50 shipped
Skully
anyway, $50 shipped

Skully