Hi, I don't think I did all of them, no point heating up anything you don't need to.

I did look at each solder joint carefully with a cheapo 12x loupe and a bright light, touched up any that were suspect. Use a pencil type soldering iron, no need to remove the old solder, just heat the joint and add a bit more, use rosin core electronics solder. I think the main suspects were the solder joints to the pins that connect to the speedo head, though I did find others too.