Got the car back from the garage today, my guess was right - the injector o-rings were shot and must have been leaking like hell. The car feels like twice as fast. I need to get it out on the highway to see if it fixed the overrun problem too. Feeling a lot more confident for the trip to Oregon in a couple weeks.

Finally got some nice weather so I picked up some 1/8 vac tee fittings and plumbed the boost gauge into a fresh 10cm x 3.5mm FPR line, reading 15 inHg vac at idle and about 5 psi when I floor it in neutral. Living downtown it might be a while before I can open it up on the road and see what the max boost really is. My neon orange 3.5mm vac line from Hose Techniques kinda rules, I'll have to go and replace everything now.

Got a bunch of PVC fittings at Home Depot for building a pressure tester and an old valve stem from my local shop. I'll take lots of pics and do a write-up after I pressure test my system.