Ahh, another cat skinned...but if you are using a custom dash it is going to get pretty tight with the radio, heater (You are using a heater -no?). Standard dash I guess you can bury the harness under the carpet.
In all honesty we have never had a problem what so ever running the wires the way they are called for...and one other thing, the harness is made to run in the direction stated unless of course you are using a Painless or other type hearness.
Options: gee-who ever heard of doing it different
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DV