I installed the subject turbo timer in my 90 TT Automatc and am having the following problems: (1) Battery voltage display doesn't display any numerical value for the voltage, (2) Ambient temperature as sensed by control unit of subject turbo timer doesn't display any temperature (0.00 degrees C), and after turning off ignition, I can't remove the key from the ignition switch. Turbo timer does count down and shuts off engine after pre-programmed period of time.At the end of the countdown, the ignition is removable. Turbo timer responds correctly to disengaging emergency brake during countdown by turning off engine. Any ideas? I have searched online and on TT NET? Thanks!