wiring harness

Hi all. i'm new to the forum and i'm looking for a wiring diagram for a Monza/senator A, the wiring under the dash and steering column is a mess resembling a more a plate of spaghetti than a wiring loom, the gremlins from under the dash n now seem to have spread to the ignition and injection...

I recently bought a 1972 Opel GT that had been stolen from the owner, then recovered by the owner. Its electrical had been torn all apart, so I need to replace it. I'm a college student, so I don't have a ton of cash, but I need this car in working condition so I can drive to school. Every site...