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Hi Don, Sounds like you are still missing one of the key elements of the system. 1. You need (and in this case you have) a venturi to make suction when you are moving. 2. You need (and in this case you have) a proper line to get that suction from the venturi to the desired instrument with no leaks. 3. You need (and in this case you have) an instrument that can use the suction to turn the gyro. 4. You need (and this is where you may have the first problem) a path through the instrument for air to flow from the cabin to the venturi allowing this flow to turn the gyro. I think you have left this hole plugged on the instrument and are not allowing flow, you should try to remove the other instrument plug and it should work. 5. You need (and you do not have) a filter to keep dust and dirt out of the gyro so that it will last more than a few hours. There are simple ones that look a little like a mushroom that screw into the fitting that is plugged now on the instrument that will do the job that you need done. On larger systems they use a central filter and plumb the incoming air to all of the vacuum driven instruments and some times use vacuum regulators to have the right vacuum for each instrument. Hope this helps. Best regards, Vern O.K. I admit it, on some topics I am in the dark. In my quest to take my G model back to original, I installed a vacuum turn and bank and a 2" venturi tube where the old 9" used to be. It is an overhauled unit, but I can't get it to work. Maybe I am overlooking something. I left the plug in the hole on the outside of the venturi. I am using the feed from the hole on the side which mounts to the fuselage. I have a 90 degree Neoprene fitting and 1/4" tubing to the T&B where I used another 90 degree fitting. There is no regulator. I plumbed the tubing into the hole in the middle of the T&B and left a plug in the other hole. Should I pull the unit and send it back, or is there some easy way to test it? Don Abbott N94411 ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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