It is an aftermarket cruise control.
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x2
Dana Brand aftermarket crusie control module
They also applied labels on it for other makes, such as AMC
Ponyguy wrote elsewhere;
The driveshaft pickup system consisted of two tiny magnets; each one was about an inch long, and about ⅛" square. You placed them 180° apart on the driveshaft, and wrapped a double layer of strapping tape over them, and sealed the end of the tape with a layer of epoxy resin. (Yes, this was how the instructions told me to do it!) The magnetic pickup was mounted to the floor pan, and wires were run up to the control box. There was a mercury switch to mount under the hood which was designed to kill the system's power if the car tipped over in a collision. The throttle control bellows was connected to the intake manifold and the entire throttle control system was operated by engine vacuum. The on-off, set, accelerate and coast functions were part of a switch assembly that replaced the end of the turn signal stalk, or on some cars, the headlight dimmer stalk.
That's about all I can remember off the top of my head... I think this Cruise Control accessory unit was sold through Sears Roebuck, among other stores...
Take a look at this kit I found in the J.C.Whitney on-line catalog. I think it's the exact same one I installed; the control switch is the same, anyway. It's a place to start...
ROSTRA PRECISION CONTROLS ROSTRA GLOBAL GM ELECTRONIC CRUISE CONTROL
$189.99
SKU Number: 1JA 934127 Manufacturer Number: 250-1223G
Improved Operation
◦Set Speed◦Coast/Reduce Speed◦Resume/Accel ◦Tap-Up, 1 MPH per tap ◦Tap-Down, 1 MPH per tap ◦Controlled Resume Rate ◦Closer, More Accurate Control of Set Speed Enhanced Adaptability
◦Works with 3, 4, 5, 6 or 8 Cylinders◦Select ECM, AC Generator, Magnets, or Pulse Sender as Speed Signal Source◦Select Square or Sine Wave Speed Signal Source ◦Quiet Operation Allows more Mounting Locations◦Select Acceleration Rate ◦Select Gain Control◦Select Manual or Automatic Transmission ◦Select Open Circuit or Closed Circuit Engagement SwitchesEnhanced Features
◦Modular Design◦Removable Wiring Harness with Locking Device◦Redesigned Water Sealing◦Neutral Safety Switch (NSS) Compatible◦Cruise Engaged Output (Ground Signal When Engaged)◦Self DiagnosticEasier Installation
◦No Vacuum Required◦Lost Motion built into the cable◦Smaller Module◦Single Unit Mounting◦New Connectors with Positive Contact and Lock◦No Clutch Switch Needed (except Diesel)◦In-Line Fuses are Closer to Module ◦VSS (Vehicle Speed Sensor) Wire Already in Harness◦Additional Throttle Hardware Included in Kit ◦Compatible with Neutral Safety◦Compatible with Distributorless Ignition Systems ◦Compatible with Direct Fire Ignition Systems
