i have obd 1 and obd 2 and i dont know why

im new to the toyota world online and real life. i dont know much bout four bangers but i do know that obd1 was obsolite around 96. i have a 99 tacoma 2.7 and the motors clean as can be. like weird clean. i just bought it from a used car dealership on june 3rd. got to lookin under the hood and noticed that i have obd 1 hook up under the hood and obd 2 hook up under the dash. obd 2 obviously works cause i hooked uyp my friends scan gauge to it and got readings. anyone got any ideas thanks

 

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The one under the hood most likely is old Toyota computer hookup, not OBD I
But then with out the pics I can not tell you 100%. Is it on passenger side next to fender ... or pass firewall? (sorry long time after my 99 is gone)

 

no its actually under my throttle body where the obd1 plug in should be and the obd2 is under the e-brake on the dash i will upload some pics in the next day or two whenever i get my camera fingered out. nothings wrong with the truck i mean it runs like a scoulded cat but i just wanderin why there are both hook ups