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Here is an older thread, It spans quite a few years (2010-2018) but it covers just about everything.
https://67-72chevytrucks.com/vboard/...d.php?t=422234
Really shouldn't have to add a ground to the cluster if the original one is there and it is making good contact. Most of the time a bad ground to the cluster is because the cab isn't grounded correctly.
LockDoc