1965 Dodge Dart Coolant Recovery Tank???

get a gauge and put sender IN the radiator hose with a hose adapter. a Puke tank can be as simple as a 2L 7-up bottle with the hose off the cap spud run down to the bottom so itll suck up the coolant when it gets cold. Need modern cap. OF course they make nicer ones but they end up just being deep slender buckets.