If I upgrade the fuel rail on an rb26 what do I do with the pressure actuator? There looks to be a hose line that leads to a pressure actuator, and the upgraded rail is just set up for fuel.

I'm guessing I would need an aftermarket fuel pressure regulator? Is there any way to connect the existing fuel pressure actuator to the aftermarket fuel rail? Thanks.

i believe there is an adapter available to allow you to use the stock pressure regulator on an aftermarket rail.
doing a quick google search i came up with this picture, which i think is what you mean?