Thanks everyone for the replies. Very helpful. Actually found the wires. They were tucked away good. Tested with the key on (not started so low oil pressure should make it alarm) and didn't have power. Thinking harder about it, maybe such indicators make the alarm go to ground instead of having 12volts? So tomorrow I'll test for a ground instead. If that don't work, not sure what my next step is.

I'm very OCD and like to have everything working correctly.

If the alarm wire is grounded it will set off the audible alarm.
I had an alarm wire that was spliced come apart. The bare wire making contact with the intake manifold was setting off the alarm.

Good news it's grounded only when the key is on. I'm going to buy muffs this week to make sure with oil pressure, it functions properly.