RPM SENSE LOSS - CONTROLLER? PART 2

HAVING HAD 3 CERTIFIED TECHNICIANS AGREE THAT THE CONTROLLER WAS AT FAULT I LOOKED FOR A CONTROLLER REPLACEMENT.
I DISCOVERED THAT THEY NO LONGER SUPPORT THE NEXUS CONTROLLER 0H06680A - NOR DO THEY SUPPORT THE 0H06680B - BUT THEY DO SUPPORT THE NEXUS 0H06680D.
SO THEY CREATED THE 0H06680DSRV WHICH IS USED TO REPLACE THE 0H06680A USING AN ADAPTER KIT.
A SEARCH FOR THE 0H06680DSRV HAD A PRICE SWING FROM $769 TO $1100 NOT INCLUDING TAX, SHIPPING OR INSTALLATION.
A NEW 8KW GENERATOR ONLY WAS $2100, NOT INCLUDING THE SAME BUT USUALLY FREE SHIPPING TO YOUR DOOR.
COULDN'T FIND AN 8KW GENERATOR BUT THE OWNER DECIDED TO GO WITH A 10KW GENERATOR ONLY AS A REPLCEMENT. GUESSING THAT GENERAC NO LONGER MANUFACTURES THE 8KW.
I HAULED OUT THE OLD 8KW AND HOPE TO FIND THE ROOT CAUSE. LESS THAN A WEEKS WORTH OF HOURS ON IT AND IT STARTS IN MANUAL.
CAMP GENERATOR IT IS!
WITH ANY LUCK I'LL POST AN EPILOG WITH THE FINDINGS.