Kevin, I have a similiar wiring setup (harness and gauges). The DD OBD2 box is great! less wiring to worry about. I ended up repurposing a lot of the wires for other purposes. This will give you an idea. If you have any questions, please let me know.
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts
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