Shorted something, gauges stuck?

[ascuro]

After several hours of trying to decypher the mess of wiring in my 70 Blazer, I mistakenly touched one of my test wires from the temperature gauge to the dash, and it sparked up. I think something shorted, but can't seem to figure out what - all the fuses look fine, and so does all the wiring.

Everything still works, except the two gauges that weren't before (temp and fuel) - but now they're stuck about 1/3 of the way up. Before, they just sat at zero/empty, and the temp gauge did max out when I grounded the sensor wire. Now they do nothing at all, even when I disconnect the battery, they still sit at 1/3. Any idea what I broke now? =)