hoo hummm. another no start car

LOL OK let's slow down LOL

1....Shorting the oil sender wire to ground should do nothing insofar as burning up wiring. All it will do is turn on the oil light or peg the gauge if used. Of course it can ruin the gauge

2...I assume? Your ignition is stock factory breakerless? Look at the 4 pin resistor. One end has both terminals jumpered across. That is the "key" end. You can jumper into that and still keep the resistor in the circuit, for a "quick test" jumper right to coil +. I would not run it too long on coil+ as the resistor is out of circuit

3...Finding positive voltage at coil: With a "normal" operational system, and key "in run" / engine stopped you should see maybe 8 ish volts at coil+ this is because coil is fed through the resistor and should be drawing current through the ignition box. Coil NEG should be quite low, 1 or 2 volts

If both sides of the coil are quite high, about same as battery, the coil is not drawing current. Either the box is not grounded, or you have a harness/ connector problem, or the BOX IS NOT GROUNDED. Remove box, scrape around mounting holes, and remount.

you can check for sure if box is ungrounded by getting power to igntiion system, as I said above, either key on, or jumpered to ballast, or jumpered to coil+. Then stab one meter probe into battery NEG post, and stab remaining proble into ECU box mounting flange. If coil NEG is high, same as battery, and if box mounting flange shows much/ any voltage, box is not grounded. If it shows zero, either ECU harness / connector has a problem or the box is bad