Not at junction box, trace green wire directly from transmission neutral-switch all way to dash. Make sure it doesn't have any bare-spots and grounded to frame anywhere. It should also connect to clutch-switch, but nothing else. Remove any non-factory wiring.
Someone probably rigged up by-pass wire because their interlock switches was broken. They fooled system into thinking transmission was always in neutral so that it would start rather than fixing actual problems.
Tach's green/white wire also doesn't go to junction box. Find it at ignitor and trace all way forward to dash. Again, look for breaks in insulation and rubbing on frame or other wires. Once you find other end at dash, measure resistance of that wire end-to-end.
Last edited by DannoXYZ; 11-13-2019 at 8:32 PM.