Anyone going to TJ, I have to recommend Mision 19, by Javier Plasencia, it's modern Baja/Med fusion but it's one of the best resturaunts I have ever been, Anthony Bourdain raved about it too. Not tacos, much more advanced and upscale, but a dope spot.
As for tacos, Tacos el Franc in Playas de Tijuana is really good, nice Crepe spot right next to it for dessert....Tacos Quiroga too, in Zona Rio, which I haven't been to, but heard is great.
My best advice for culinary exploring in Tijuana is just grab a taxista at the border, and just tell them to take you to a taqueria, or mariscos spot. You don't want a tourist spot in Revolucion, you want somewhere locals eat...A taqueria can be set up like tacos El Franc, more or less a a casual restaurant, but often taquerias are set up on corners, with a few plastic chairs and tables, and people cooking in makeshift kind of grills, those are the best to me. I hit spots like that in Sinaloa and Baja, and am never let down.
lol and it's a complete misconception that ANYONE not involved would be at high risk for violence in Tijuana, Zona Norte is hot right now, but thats the sleaziest hooker/drugs/sex Red Light District, and the street dealers are getting murdered, so you MIGHT see some shyt, but that's high risk behavior anyway, in any city.