cluster connector

73 duster..factory service man...I added a ground wire to the case and tied it to column.checked for continuity..all pins are like new ..checked for cont with a jumper to batt all bulbs and holders are like new and working..all contact points are clean and tite...checked....lite wire brush..temp gauge comes 1/8 of an inch past first mark at 170 degrees .after mrkt gauge][ivl]..three contact points were scrubbed to clean for contact..i cant figure its anything other than not getting thru the orange wire..appreciate your help.i went out and looked at the fuses..all good..two 3 ampers and the rest 20 ampers.where is a fuse location marked' inst'...j