arcturus;
I don't quite understand your question, but essentially, you need Ign power to supply the DR, and this in-turn supplies the Instrument. Where you get Ign power from is non-critical, so it could certainly come from Fuseblock, but since Ign power wires need to be removed from Inst. anyway, they are (already!) right there, so it makes sense (is simplest!) to reuse them to supply DR, as shown in my sketch.
I hope that answers your question, and makes it a bit clearer.
Cheers
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