We'll I may be going out on a limb but I believe the OEM 7 pin wiring on your FR3 and your Tundra will be a match.
At some auto stores (Advance Auto, Autozone, etc) you can purchase 7 to 4 testers with LED's to show correct lighting signals.
My toad wires the same from my Georgetown and my buddy's F-150.
Good luck.
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Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain
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