Well Ive just received my 20:1 attenuator to use for analyzing the injector waveforms on my 1994 volvo  850.
Looking for advice on oscilloscope connection to avoid damaging the unit,any recommendations.
I'm not using a pico scope just a standard labscope.

cheers Ian

If I chose the correct vehicle, it looks like they are all fired at the same time.  Makes it easy to pick which wire, the grey one.  This may be a good one to also practice using your current probe ( if you have one ).  Make sure you have your scope grounded, install your new shiny attenuator ( I would also double check to see if you need it like RT mentioned, but when in doubt use it anyway first and go from there ), and backprobe any of the injectors on the gray wire.  If you have an amp probe you can check the injector amps too, but this image may change depending on where you have it placed and the condition of the injectors and their circuits.  Try the voltage trace first and try to post up the image of what you got and we'll go from there.

My first go at grabbing  injector waveforms on my 1994 volvo,didnt have time to hook to a computer so i took a screen shot.
All 5 injectors have the same waveform