I’d recommend an Orion 60mm guide scope with helical focuser and ZWOASI120MM-S guide camera for your 150mm newt mounted on your tube rings with a 14” losmandy dovetail bar ( nice solid guiding set up )
Oh and use PHD2 guide software , it’s free and used extensively around the globe so plenty of support locally including IIS forum
For your smaller refractor you could get away with a 50mm guide scope and mini ZWO guide camera or just use the 60mm
Photos of my 150mm and 200mm imaging newts
Good luck and welcome back
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