Apparently, the starter solved a problem since it didn’t work before and works now.
I would carefully go over what I did to replace the starter and see if there is anything I forgot to connect or improperly connected.
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=== Update (10/24/2021) ===
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The twitching of the instruments, suggests the voltage is dropping severely low when it tries to start. That would be because the battery is bad or the connections to the battery are corroded or loose. Remove the battery connectors and clean the terminals and inside of the connectors with a wire brush. Then place a thin film of grease on them. Replace and tighten. If that doesn’t solve it have the battery tested at an auto store. I like Advance Auto’s tester.
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Battery voltage should drop to no less than about 10V when the starter is engaged.
Apparently, the starter solved a problem since it didn’t work before and works now.
I would carefully go over what I did to replace the starter and see if there is anything I forgot to connect or improperly connected.