I've actually had a dry scalp, but when scratched no dandruff. I've also had dandruff, but not an itchy scalp. And, I've had a dry, itchy scalp with dandruff.

For me, if my scalp is itchy but no dandruff, then I need a tiny bit of oil massaged on my scalp. If I have dandruff, but no itchy scalp, then it's the product. If it's both, then I used too much product. At this point I usually dampen my hair, and rinse my scalp with water. The problem is gone.
Mod CG-Naturally Highly Porous and Dry
This list is not exhaustive...

Using the O.L.C. Method:

O-Mongongo,Tamanu,Pure Vitamin E oil
L-
Curly Q's la la Meringue Curl Moisture Detangler
C-MJ Multicultural Curls, various

Cowash: various
DT: Bed Head TIGI Self-Absorbed Conditioner, various
PT: Gold Medal Herbal Tame pkg. mixed with a deep conditioner
Sealer:
Pure Vitamin E oil


*experimenting and loving it!