Yep,it's a mechanical speedometer transmission.
Clean the top off,there should be a sticker decal with the model number.They start out with 1352-???.See this link for Identification. T5 Identification

your electrical plug will be for reverse lights.


Tim

1951 3100 Chevrolet
1951 Chevrolet Suburban Carryall
Image
"A house is built with boards and beams. A home is built with love and dreams."
"Look deep before you leap !!!" / "Everything is Everything"
"If I say a mouse can pull a house, hitch him up"