Ok, that sensor that was painted over is probably the oil pressure sensor. I could be wrong because mie is in the different location, but that should be it. That could be it but thats not the first place id start.

Check for spark: Take any plug out, plug it back on the ignition wire, hold it next to your valve cover, then have someone crank. Look for spark.

Check for fuel, loosen the fuel line bolt where it goes to fuel rail. Put your ignition to ACC fuel should come out when pump primes.

If its not cranking. Check battery, charge it. Make sure the connections to starter are solid. Check the ECU ground on your thermostat housing, make sure its not corroded and has metal-metal contact. Check all other grounds.