there should be several, I ran my boost gauge line, Amp cable, and alarm wiring all though the firewall and i have never drilled any holes. Check the drivers side near the brake booster and the intake manifold. they arent easy to fish wires though, but they are there..
If you're trying to run wires for gauges, on my car I just pushed them all through the very top of the boot around the steering shaft. Haven't had any problems with it yet.