I will take the ground off and clean and retighten it.
I can't remember if this alternator was put on when I revived the car, but I don't think so, so I will replace the alternator and belt.
I am going to replace the instrument cluster with one out of my parts car is there anything in particular I should watch out for?

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Ncnetman
1959 Chev 3100 Fleetside
1965 Mustang
1968 Torino GT fastback
1969 Ranchero
1974 240d 4-speed -for sale
1976 240d fresh paint- on hold
1978 300cd fresh paint and new rearwindshield rubber
1990 6.2 Suburban 194k-getting a 6.5 turbo
2008 Duramax Silverado
2015 VW Passat TDI