Sorry if this is an obvious answer, but I couldn't find anything about it in the Epic rules or on the forums. I was playing in a small epic tournament recently, and I brought a CR90 with Quad Laser Cannons on both the fore and aft sections, and a Tactician equipped to the aft. I had assumed that Tactician would apply to the Quad Lasers on either section, but my opponent thought that it only affected the aft section's attacks. We couldn't find it in the rules, so we decided it only applied to the aft.
I know that upgrades with the "Action" header can only be used by the section that equipped them, but is that the case for upgrades with passive effects?