The wiring needs to be cleaned up. Again. I also now have the AXE 7245 controller instead of the Kelly I had before, because the AXE can use the 0-5V from the carburetor TPS, which I'll try to use as the throttle.
A bonus picture: Vacuum pump and a valve I attached with Sugru. The valve stops the vacuum from escaping. It's made from a 4.99€ brake bleeding set from Biltema. Inside the metal part there's a ball and a spring, which let air go out, but not back in.