Painless Harness???
In most cases you have a 12+ hot ignition on wire that routes through for the back up lights. The two wire switch on the trans allows the 12+ wire in and then out to the lights. The lights are grounded near the rear body panel. It appears you will just loop through on your two wires under the dash. You will want to power it up and verify that you have a 12+ ign on on one those two and the other goes to the back up lights in the harness.
The thick wire is your neutral saftey switch. It interrupts the 12+ ignition START power to the starter unless the car is in park/neutral...or the clutch is in.
If you wish to make it functional you will need to get a neutral saftey switch for your clutch pedal. Or, if you want to live on the wild side you can wire it direct, but the car will be able to start in gear that way.
Or...you can run it through a hidden switch for anti-theft override.
Hope that helps!
BTW-the saftey switch wire is usually purple, and back up light power is usually green.
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