Walthers O Gauge Crossing Gate 933-2702 Wiring

Haven't found instructions on line.  And I was unable to attach a jpg of the instructions that came with it.  There is a lever switch (kind of like a giant toggle) with pin connections for AC and three wires to the gate.  Also connections for the option of actuating it with an insulated rail.  I started to disassemble the lever switch but stopped when I saw what I think was a little PC board...probably to make the light flash.  It just dawned on me though that I can put an ohmeter between the AC pins and the black/red/white to see which one is common.  Actually it also just dawned on me that I can probably use the connections meant for the insulated rail to go to my momentary contact switch. 

Thanks Dale.

I hooked it up according to the Walthers instructions for automatic operation except instead of using insulated rail; I hooked the yellow wires to one side of a DPDT momentary contact toggle switch with the other side of the DPDT switch used for the MTH crossing light.  Works fine on about 12 VAC.