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All the recent talk about the legality or illegality of wiring modifications has gotten this newb very worried about what exactly is acceptable.
I was planning to run an additional fuse block/relay to provide constant and switched power for things like the data logger, shift light, etc. and keep the wiring clean, but I wanted to confirm that this is legal. To get an idea of what I'm thinking, please Google "Painless Performance CirKit Boss" (unfortunately I can't post links). Thanks!
As long as they're providing power to allowed devices, they're legal.
Additionally...
Gauges and instruments may be added, replaced or removed--they may be installed...(in) any other location using a secure method of attachment.
Antennas for two-way radios may be added.
Each of the foregoing generally requires additional wiring
Just be sure that the kill switch in your car kills everything on your new circuit as well.
Fantastic. Thank you all for the answers and advice.