dummy light dash cluster swap to gauges cluster

[tjmeadows]

My brother in law has a 68 with idiot light cluster, I game him a gauge cluster from my 69, does anyone know what changes he needs to make to the electrical clip on the back to make the temp and volt meter work correctly? He has a ZZ4 upgrade and has been using a cheap set of gauges under the dash, wants to discontinue that and use the factory gauge cluster i gave him. This is above my pay grade, any help would be appreciated.
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