Got the project done today, thanks for the assistance Brain.
Here's a few photos, but with the diagrams I put up earlier should be self explanatory.
I gutted the oem tps, and used a Honda wiring harness from an accord, about 96. The wiring colors are similar across the board from b16s 18s and my find, an f20 or something.
Gutted TPS all soldered up.
Basically, as mentioned, here's the wiring for an 05:
Miata ------------- Honda
LtGrn/red ------- Yellow ------ 5.0v power
Blk/red ------------ Green ------ Sensor Ground
Green/Blck ------ Red ------ ECM Signal
Run the wires up through the bottom hole of the TPS, and solder them to the small metal spots there. You have to lift the little tabs up and out of the way, you can put them back after soldering.
Here is the layout of the TPS points and honda wires in the right order.
All wired up. Had to extend the harness out.
Super glue or what have you it together, and you are good to go.
Should be an easy mod, and I tested it in my Hydra, everything was right.