So here is what I did. Switch was sourced from Painless Wiring but in actuality is a Cole Hersee switch. Got new pre-terminated battery cables - 1 Gauge units made by Grote sourced at Grainger. These cables are really nice. Fitted lengths with various end fittings. Made bracket from 1/8" aluminum machine screwed into the firewall under the vent area. Leads run from Bat negative to cold side of switch and hot side of switch to lowest stud on pedal assembly. Stud was too short to I sourced new 13mm bolt longer that previous and put a permanent nut to secure to the car and put the batt cable on the stud with another nut. Very positive ground. I am very pleased to finally have a good kill switch as the old "green knob gizmos" all failed to provide necessary grounding. I can provide part numbers if anyone is interested.
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