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000_0044.jpg

Lets try this
 
I'm 100% certain that is the reverse light switch. If you want to double check me, put a multimeter with one lead on each of those two terminals and shift the trans into reverse. If the circuit completes when in reverse its the reverse light switch.
 
I think the switch is something for emissions. I downloaded a wiring schematic for a 72 and it shows a switch for manual transmissions. One wire from the electronic spark control and the other goes to an emission vacuum solenoid. I don't have that stuff on my car, it must have been removed from a prior owner. The schematic says the switch is open in third and forth but when I tested it closed in third. I found a parts diagram at the same web site which had a lot of usefull info. the switch is number7E449. http://www.7173parts.com/images/tech/illustrations/9881.jpg
 
I think the switch is something for emissions. I downloaded a wiring schematic for a 72 and it shows a switch for manual transmissions. One wire from the electronic spark control and the other goes to an emission vacuum solenoid. I don't have that stuff on my car, it must have been removed from a prior owner. The schematic says the switch is open in third and forth but when I tested it closed in third. I found a parts diagram at the same web site which had a lot of usefull info. the switch is number7E449. http://www.7173parts.com/images/tech/illustrations/9881.jpg

The Ford book lists a such a switch for 73 Torino and Mustang with 4-speed manual transmission.

D2OZ-7E449-A Switch, Seat Belt Warning Sensor (D2AR-7E449-BA)

I'm guessing unless you are hard-core trailered show you won't bother fixing this one.
 
The Ford book lists a such a switch for 73 Torino and Mustang with 4-speed manual transmission.

D2OZ-7E449-A Switch, Seat Belt Warning Sensor (D2AR-7E449-BA)

I'm guessing unless you are hard-core trailered show you won't bother fixing this one.

I guess by when you get to third gear the seat belt warning goes on, I won't be trying to hook this up. I guess people get rid of stuff like this along with those key buzzer relays.
 
I guess by when you get to third gear the seat belt warning goes on, I won't be trying to hook this up. I guess people get rid of stuff like this along with those key buzzer relays.

IIRC, it was supposed to buzz and illuminate in any gear. The 73 also had a sensor strip in the seat bottom, and switch in the belt buckle, to make sure both front seats had their belts on, even a bag of groceries. Remember, this was the heyday of the safety fascists. Some cars disabled the starter unless everybody had a seat belt on.