Digital speedo and display very dim on z750
Sounds like you have a faulty connector/wiring to the display unit, most likely a bad connector (known as a dry joint) leading from the ECU junction relay box. Dry joints/circuits a sensitive to vibration!
Getting the wiring checked by an auto electrician to make sure where the fault is actually in the wiring.
If the fault is a dry joint in the wiring, re-soldering the connector will fix the fault.
If the fault is a bad wire, replacement of the wire will fix the fault.
If the fault is a dry circuit in the display unit, replacement of unit necessary(costly & worst case).
Have a full Kawasaki service manual for the bike on an USB STICK in PDF form with you, when you take the bike to the auto electrician, it will help them find the fault quicker & cheaper.
If you haven't got a full service manual, you can download PDF file from the internet, the cost very minimal compared to a printed manual.
When I had my problem with the electrics on my Z750S, the fault was with the connectors(dry joints) and re-soldering them solved the issue!
Hope this helps
on Apr 09, 2014