340 Dart Sport cranking issues

Ok so I’m having some sort of weird electrical issues on my car with it cranking. I’m running an MSD 6AL box with their distributor and coil. So the issue literally just started out of the blue after messing with the ground strap on the sending unit. So the car will fire and run fine. If I turn it off and try to restart it it just sits and turns over. I have to wait 30 to 45 solid seconds before it’ll fire again. If it tries to fire and doesn’t it’ll do the same thing. We pulled the plug wires and there is no fire during this time. The. After a minute it comes back and it’ll crank. Like I said I was messing with the ground strap on the fuel tank when this started. I took the ground back off and still no luck. I was trying to get the fuel gauge working and have opened a whole can of worms apparently! I’ve checked over all the ignition wiring as well as the starter relay. Any ideas on where to look next???? Thanks for any insight!!