can i have the instructions for installation?

Yes, you can go to youtube to find one vedio, or you can email us to get PDF file.
thanks.

What’s the difference between the universal gear indicator for $21.99 and the indicator for $27.99?

actually speaking, there is no more difference, the 27.99 display is little thicker than 21.99 display, thanks

Which gear indicator for 1984 Honda VH500F Interceptor? No Computer?

You can order our universal gear indicator with shift lever sensors.
It is universal and many installation guide on youtube.

Will this work on my honda shadow vt 400cc 2004

it works as gears 1 0 2 3 4 5 6, if your bikes gears working like this, it works.
the important thing is the sensor and magnet, you need intsall it correctly.

How did i bevor the neutral Signal? I install the white cable at the +cable from my cocpit neutral light, nur the Sensor didn‘t Switch to 0

You can connect the white cable to the earth, or the body of your bike. It is neutral cable.