The top turret mount is piped for power and weapons, but not sophisticated scanners and datalines. Remember that the Prowler design hails from a period in history where the UPE and Tevarin were in conflict, and at that time, the UPE was technologically superior to the Tevarin in many ways. While the Tevarin had some unique and interesting shield tech, they lagged behind the UPE in others, and raw avionics power was one of them. Additionally, Tevarin use of Prowlers was focused on the taking of objectives identified by other ships and operatives in the fleet, and powerful (and potentially noisy) scanning arrays that could interfere with its stealth were rejected in favor of providing more space for troops, their equipment, improved stealth features, and effective Grav-Lev plates.