Just follow this scheme:
I am not sure if you know this but I'll explain just in case. There are 2 contacts on 4 legged switch. I connected legs with green lines, those are same contact. You can solder left or right doesn't matter.
I don't have new photos but I hope this will be understandable.
I first soldered buttons and trigger.
There is bare wire already soldered. It is common ground wire connecting 4 switches, like green wire on diagram above. Red wires connect according to their names to first image. S4 is in yellow triangle I am not sure which contact. If you make mistake it doesn't matter, other one is S1.
Next POV switch:
Look at U shaped bare wire on the switch. It is also common GND connection. I soldered black wire and connected it according the first image.
On the outer edge are switch contacts. Just solder like I did.
Please use multi-meter if you are not sure which contact is what.
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