I'm Marc, SIP dealer in Belgium.
One of my client have this problem with his sip digital speedometer that I installed (part nr 50000710).
He wrote me this :
Along the way the counter go crazy every time. After a good twenty minutes drive, it says 199 km / h and then nothing like speed. The needle Tours has also disappears going on the max. Just the temperature and time remaining. The space of km / h becomes completely empty. And it's really every time
Do you have any idea what is happening ???
Thanks for your help !