It ended up that only my A4 seemed to be active and the resistor was needed as you suggested. I'll post my finished product when I clean things up. Very fun kit!
I was wondering if you have any suggestions for troubleshooting aside from what is mentioned in the instruction sheet?
My voltage adjustment and test went well, no problem uploading the code. I'm using a single National 8037 Nixie but doesn't seem to want to light. I've tried setting the delay as low as 40, and high as 400 with out any change.
Currently I only have Anode 1 and a single Cathode connected (thought I would test in this mode before getting it all together. Any reason this setup shouldn't work?
I noticed on my Nixie pinout it lists pin 1 & 8 as "Internal Conn," I just have these open at the moment as I'm not sure what they are for.