disconnect ground first
After using an impact/BFH on the cross drive screws of the windscreen on the 40(1 of 16 freed), one lamp went out! Bugger. Pulled the cluster, re-connect plug, clean lamps/bulbs and... guages are now brighter! After 44 years the light bulbs were dirty. Sometimes it's simple and I am lucky. I do get your talkin' 80 series, but maybe the stock lamps just need a cleaning.
L43dean-1968 Fj40 LandCruiser,1980 Rn47 Hi-lux Pickup 4WD and 1985 Rn65 ExtraCab Truck 4WD. YEP!