If you start deleting things the engine wont run correctly and might not pass inspection.
The diesel toys conversion is passable and it all communicates perfectly.
Keep in mind, the 1KD is used in the Prado (150) that the FJC, T4R, GXs share similar systems on.
Not plug and play, but damn close of one had the harness that Diesel Toys created.
Toss on a long travel kit and it'd be a sweet all around wheeler.
Not worth it, as it affords a nominal gain in any but high speed environments.
Best money spent on an FJC for wheeling is tires, lift, crawl box. Much beyond that and it might as well be SACd.