Gauges for 66 Dart GT

Hello everyone,

My Dart has gauges replaced by former owner & he installed the cluster from a similar vintage barracuda. This is cool as it includes a tach, etc. Trouble is, only some of the gauges work. Pulled dash over weekend and the wiring was, well, creative. Perhaps eventually I will try to get it all working properly, but in meantime, I want to add a set of simple electric gauges so I can watch oil pressure, temp, etc.

Anyone have recommendations on brand/model they are happy with?

I presume I need to replace current sending units for oil, temp with new gauge sending units, but can you confirm?

Thank you.