OBD-1 sensor readings

I have heard you can get realtime sensor readings through the ALDL port on OBD-1 equipped vehicals... How does one do this?

I have heard you can get realtime sensor readings through the ALDL port on OBD-1 equipped vehicals... How does one do this?
What vehicle are you looking to do this on?
There are a couple of options...hand held scanners and /or a laptop with the right software and a cable to connect from the ALDL to the laptop