I have the same setup and I cannot get the anti frezze into the little tube very well... I did it once and it worked for a bit but now my brand new fass 150 and new gauge reads 5psi which I know is not correct cause there is air in the little clear tube lines going to the gauge... how can you fix this issue??? im tired of thinking i have 5 psi lol

I dunno man im probably not going to use the isolator thing.

So what would you use instead of the isolator going from 3/8 hose to the small plastic tube???

I didn't really put much thought into it, until i started to put it all together and noticed i pretty much had to use the isolator if i wanted to use the kit they supplied.