I got a old1956 Ingersoll Rand air compressor with a 1920-1930's Wagner electric motor (1 1/2HP). My grandfather used it for many years and now Its currently in my garage, I have been using it on 110v. Unfortunately she wasn't strong enough to keep up with the work I do. Apparently the motor can be run on 220v, which is perfect because I have 220v in my garage for my Welder. The problem is the wiring diagram is confusing me, and my biggest worry is if the safety switch will turn the electric motor off when the compressor is full of air. Currently I have the motor wired up Red+Black hot and Green neutral, I plugged it in for a few seconds and she roars. I just want to confirm the wiring I have made and if its safe to operate. On 110v a hot + neutral wire each went from wall to line then from load to motor. If I wire it 220v that means two hot wires go from wall to line then load to motor? I figured there are some electricians on here that could give some advice, I would like to get it running today as I have too many projects to complete and would love to be using the compressor again haha. Thanks.