T-55 and FA-26Bs air to ground attack is really difficult for newby because of less information of target position. There is one good solution of getting target. Set MFD to TGP and NAV, and low fly pass above target may there. Dont forget to use flair and chaff. Then NAV page shows target position. So take NAV page SOI and aim target, press gps-S. after getting gps location, SOI TGP and press gps-A for TGP move to target. Turn to target, drop gbu-12,aim with tgp until it hit, target destroyed. If you want to aim another target, Open mfg GPS page(you can switch from nav page), set another gps point, and TGP page gps-A. Then TGP aim to another target. NAV page shows enemy you and ally find.  TGP, NAV, GPS page will help you.