65 Dart wiring push start

Hello y'all

Can someone point me the right direction. 65 Dart with 273 won't start. No crank. Has power. Battery is fine. I jump the starter and it fires up. The dash harness looks worn out. I would like to wire a push start button and call it a day. Can anyone give me the short version as to what what wires to hook it up to?

Thanks
Is this automatic or stick. If automatic, the neutral safety switch down on the left side of the transmission GROUNDS in park or neutral. This is connected to one of the small push-on "flag" terminals on the relay, which is the coil. The other flag leads (usually yellow) through the firewall to the ignition switch "start" terminal. Very very simple circuit. I would inspect the key switch and connector / terminals, and inspect the bulkhead connector, AFTER checking the NSS

Try wiggling the shifter which indicates a failing switch or out of adjustment or disconnect that wire at the relay and temporarily grounding it. CAUTION. Will start in ANY GEAR doing so

IF IT IS STICK and has an OEM starter relay, the one terminal is soldered to the case and the relay case MUST be grounded

Run over to MyMopar. You can download many years of service manuals, and 2 page aftermarket wiring diagrams over there