DPS Lounge.... And BKK FT
Just flew this trip this wk... Yes, you will get a Fast Track card. Just go to the FT line on the far right at immigration (I've never had them actually ask to see the card, tho).
Anyway, on ck in in DPS, be sure to get the pass for the Premier Lounge... It's the nicest Lounge at DPS. TG has a tendency to divvy people up between lounges...there are 3of them. So not everyone automatically gets the Premier Lounge.