Ford 340 Indicator lights

I just bought a 79 Ford 340 industrial. The ignition switch was taken apart and I had to hot-wire it to get it home. I think I have it put together properly, but there are two lights that flicker intermittently. One is the second from the left and looks like a tapered arrow with a bunch of dots in it and one is on the far right that looks like an upside down key-hole with a tear drop in it.

Any ideas what those lights are? Any ideas why they might be flickering?

Thanks in advance.

Anybody happen to have a wiring diagram handy? I'm thinking the oil pressure is ok. From what I hear, the lights been off and on for a while, and it still doesn't miss a beat.

Where will I find the oil sensor and air flow sensors?

Also, what's the big knob on the side attached to the air cleaner for?

Also, was there ever a hot injector on this tractor? (pre-heat) Was one of the wires that I connected to the ignition for that? There seemed to be one extra.

I really need a wiring diagram.

Thanks again.