The A&P/IA I spoke to said he wouldn't sign off an annual or any other document with a non-TSO'd instrument installed in the airplane as required by the FAR's and type certifucate.
He also said the non-TSd'd instruments were made mostly in China and couldn't be overhauled or repaired. The instrument in question for me was a VSI I wanted to install. My solution was to mount it to the instrument panel with a bracket held on with Velcro. Works just great and I can "remove" it ASAP if I need to. $100 vs $350 plus labor. Noel Anderson Canaan, CT
