I cut the tubing to the right length with some kitchen snips and press fitted it into the pump. I also drilled a 1/2" hole through the lower back of the pumpkin and ran the tubing through. The pump is adjustable but even on the lowest setting it had plenty of power.
I used a small drill bit to make the exit hole for the blood, up by the pumpkin's eye. It is drilled out larger on the inside to fit the tubing in. The nice thing about drilling into pumpkin is you don't even need a drill, you can just spin the bit with your hand.
The hardest part of the whole project was trying to find a bowl that was the right size! I looked through a half dozen stores and had no luck finding a bowl that was big enough or cheap enough. My girlfriend thought of using an automotive oil drain pan and it ended up being perfect!
Every Jack O Lantern needs a light and a flame would not work well in the wet environment of this pumpkin so I opted to use LEDs. I used one of my red LED boards (which are available in the Instructables Marketplace ;) ) which is powered by a 12volt battery hidden behind the pumpkin.