Misinformation much? Yeah.. don't listen to those guys..
An SOHC digital cluster will work on an SR20DET or a KA24DE as long as you swap in a DOHC tach. The thing is if you swap in an analog DOHC tach it won't look right as the analog clusters have a bigger tach than the digital clusters. When you install it, you will barely see the RPM markers on there. It will work, but won't look perfect.
As for your speedometer, it's broken and you can try to fix it by looking
here.
Also..
SEARCH!!!!!!!!!!!11eleven