да у меня все ок,
вот инструкция.
1. switch Tacho device off
2. connect Tacho to PC via null-modem cable (pinout: DB9 5-5 2-3 3-2)
3. switch Tacho on & put it to SYNC mode (press OK, input your PIN if set,
then select SYNC from menu). LCD should show "...???SYNC???...".