Row TAC is the Handicap Accessible portion of seating found in Row T (the AC being an abbreviation for Accessible). As such, these seats are located 18 rows up from the front of the section, and are comprised of movable folding chairs.
The Left Field Pavilion seats in sections 144-151 should absolutely be avoided if you want to stay out of the sun. Especially during late afternoon games and evening games, fans in the LF Pavilion will have to deal with looking directly into the sun to see the infield. Besides for dealing with the sun, the main scoreboard is located directly behind and above these seats -- good luck seeing it.
Unless you want to get a good look at the Tigers bullpen (in sections 147-148) or the visitor's bullpen (sections 149-150), these seats should be avoided.