Not a c but hopping someone knows what this it. New to me.

BJS racing

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does anyone know what this is? It's on a 78 Lil Red Express truck. Not as familiar with the newer systems. Mopar regulator.jpg

Mopar regulator.jpg
 
Found this on the net ;

1977 Dodge B200 VAN
Electrical Switch
Part Number: 3874129, part number 3874129 H8D printed on case potted three terminal electrical timer/switch operates vacuum switch on carb which kicks throttle plate open.
 
Any ideas on where to get one ?? I'm in need .. thanks
 
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