oil pressure sender won't work with a drain.
oil pressure sender won't work with a drain.
Tapping into the OP sender would not work. You can not drain oil against pressurized oil.
Re the pump the only advantage is that you could plumb the return into the valve cover and hopefully taping a return line into that should be much easier.
As for the cheap one I posted if it is for a challenge build it only needs to last for the challenge if you want something that will last and can be the correct way to do it look at the Weldon pumps we have used them for many racing applications for trans coolers and dif coolers in T1 Corvettes among other things. Moving the small amount of oil needed for a turbo would be no problem for a Weldon pump and they are VERY well built units but you are going to spend anywhere from $250 to well over $1K depending on the application and specifications needed.
You know I would be inclined to make a stand alown oiling system for the turbo at that point. Pump the oil from a tank down low through a cooler to the turbo and then let it drain back to tank. With a little fiddling you would put a bypass in the line to the turbo that would allow the oil to be recirculated for cooling purposes while still supplying oil to the turbo. Then you would use some very hi grade of oil with a viscosity specific to the needs of teh turbo and use what ever oil the motor needs.
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