Okilee dokilee....
YES, grey wire in pic #1 goes to the oil pressure sender. Must be the domed-top type for a gauge, NOT the little black one for idiot light.
Big black goes to the 1/4" terminal on the alternator. Blue & green go to the field. (Clip onto alt.)
Brown goes to washer bottle. Green w/ red stripe are for horns.
L-shaped clip/wire goes to the starter relay (earlier referred to as a solenoid).
I think the blue wire in the bottom pic is for your blower motor. The blue one you now have plugged to it......?? Looks like Choke thermostat, but I could be wrong.
Tan wire in bottom pic........??
Steve