...Routing SDS wires thru firewall. The WB sensor connector will be attached to the batt. box with a drilled hole which will give it some room for vibration strain. At David's suggestion, I drillde another firewall exit for just the sensor wires above the R engine mount. A hole saw does the trick with patience and losts of cutting oil. I will run the power wires thru the pilot side access and place a stainless steel overlay over the center entrance, now unneeded.
