The turn signal relay... It's up here somewhere... (Behind the gauges on the driver's side)
Aah, there we go...
And here's the part I'll be replacing it with...
Two hours of troubleshooting later, I learned it's not the relay. I couldn't figure out why I could get the turn signals to light up with the fuse pulled out. Then I couldn't figure out why I couldn't get power to the relay socket. Tracing one wire after another lead to this...
That's where the hazard flasher goes through the... Is it still a firewall if it's on the other end of the car from the engine? The dash support. Whatever. APPARENTLY I had disconnected it at some point while installing the backdated dash. Fudge. Oh well, I guess I've got a spare, and it was only like $15. Next up is installing the basketweave material on the dash to cover up that ugly aluminum and make it actually look finished.