Jessey,
I didn't use any series resistors on my MAX6675, but it's probably a good idea to use them. It shouldn't cause any accuracy problems... it's all serial data, not analog signals.

I grounded pin 2 on mine. If it's grounded, then the MAX6675 can tell when there's an open probe. (type K probes almost always fail "open") The data sheet explains it.

Have fun!


Steve