All Laplanders in Norway are 24 volts and have shielded systems, just like yours.
All garages with a standard stroboscope lamp can time their ignitions.
I bought a cheap stroboscope lamp myself, and it\'s working fine.
There can be a problem with the signals from the wire, but then you just have to take it off, turn it a bit, and try again.
A garage should not have a problem with this, I can do it, and I\'m NOT even a mecanic
Maybe you had bad luck in choosing the right garage?
All types of stroboscope lamps will work on the shielded system, but som can be more hard to use, than others.