Anyone got a match ???

Hi folks, I'm sorry to bother you all again... more electrical conundrums. Finally changed the ignition switch. The one from Rock auto was slightly different so required so cutting. It's not a task I would want to do again...
Anyway changed the switch and now have a different set of issues. The Dart would not start. I believe its the neutral safety switch is the issue. It'll start in neutral not park. However the melted fuse link I replaced with a maxi fuse and now when I rev the engine the alternator gauge goes off to over +44 and fuse blows. I noted the fuse holder was very hot also...
Also the fuel gauge still doesn't register!! All these faults started with a leaking fuel tank!!
Any easy advice most appreciated. Thank You all again