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Make sure that you have 'plumbed' the vacuum line to the correct port! When I bought my first Coupe I found that my gyro horiz. was not working because someone had plumbed the vacuum line to the port marked INLET! This is where the air goes IN! These instruments where made to run on vacuum OR pressure. Also 1/4" line seems kind of small-lot of friction loss. Craig 9772M
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