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1979-1993 & 94 Conv
Thank you for posting at TSN!
The APC gauge vacuum line connection for the 1990 900T would typically be installed at the aluminum intake manifold grommet connection.
This vacuum line should be tested to hold vacuum or pressure before connection to the intake manifold as this line provides pressure to the APC gauge, the APC pressure transducer, as well as the pressure cut-off switch.
Over the years, we have found many customers or shops disconnecting the APC/boost gauge vacuum line after finding a leak behind the dash board due to the complexity of access. Due to the heat and age on these lines, many split or could require replacement behind the dash board.
Best of luck with your fix and please reply if any questions arise.
Gary K. at SDI
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