Gear indicator malfunction when engine is cold.

[lather]

I cently had service done to replace a bad fuel sensor and recalibrate the gear indicator. For a few weeks after the service the gear indicator was working properly. But this week the gear indicator has started showing 2 while in neutraland tno green neuttral light when the engine is still cold after start up. After a a few miles and the engine is warm the gear indicator and neutral light work properly.

The main problem with this is that when the engine is cold it will only start with the sidesatnd up or without the clutch lever pulled.

Any ideas why the gear indicator would not work with a cold engine?