Before I picked up my -89B, I looked at both as well. The display on the -90 is a bit crisper, however, the -89B is plug compatible with the KLN 94. I figure that if the 89B dies, I can replace with with a color -94 that is still in production. If the -90 dies, you'll have some wiring to do.
-Brad
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Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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