Ammeter Bypass a Must?

74 duster. Definitely some plastic in there. Thank You. Any suggestions?
What car do you have?
Just scored one in Canada for 25 bucks + 14 for the ride. Hopefully it's the right one the gauge itself is around but I'm thinking that's my cluster and it's too late to pull it out right now I've got to pull it out tomorrow to put a vinyl overlay on it and I'm fixing to blast the floorboards down, rust encapsulate them