Fuel and oil light when driving

[JelleButtiens]

Hello everybody. Let me start by introducing myself.
I’m Jelle, 36 and riding motorcycles since before it was legally allowed.
Recently I have bought a Bulldog with Producside sidecar.
The bike has 69.000km on the clock and runs fine, only,
sometimes while driving my oil and fuel light start burning, and the speedo does a full sweep, after the needle returns to zero my
dashboard works like it should. This happens about 3 times in 20km. There’s no real trigger like a certain speed or rev range.
The bike just keeps running fine, so ignition still works fine. So far I have checked the ignitionswitch wiring and the 5Amp fuse,
but I can’t find anything wrong.
Does anybody have an idea what could cause this?
Thanks

[RedSun]

Moin,
The capacitor kit may not be installed.
You can find illustrated instructions (German) for self-assembly in the attached PDF.

Uhr-Tacho_Puffer.pdf

(609.63 KiB) 105-mal heruntergeladen

Uhr-Tacho_Puffer.pdf

(609.63 KiB) 105-mal heruntergeladen

[JelleButtiens]

The capacitor kit is installed, and my tripmeter doesn’t reset when this happens.
Yesterday I’ve checked the wiring in the front and disconnected the negative battery-lead.
When reconnecting I’ve noticed the positive lead was rather loose, maybe this caused it.
Will have to do some driving to test, and I’ll keep you posted.
Thanks

[JelleButtiens]

Did about 80km and no more flashing lights!
Still weird that the loose cable didn’t cause ignition failure. Anyway, glad this is sorted.