I made my own, It worked good. Used aquarium tubing, welder tips for restrictors, and bought the 5mm adapters from california sport touring. In the end, I would just buy the 40 dollar mercury off ebay. I didn't save too much, and that seems like it would work just fine.
Tubing 50 feet: $6
3 way adapters: $4
Restrictors: $7
Adapters (shipped): $15
If you figure in zip ties, and ATF fluid, it cost more, but as is, it cost $32. PAY THE EXTRA 10 BUCKS FOR THE NICE SETUP!