You should probably contact the team at LinkECU to see if your ECU (no idea which you're using buddy!) will allow for this.
If your ECU does then I'm willing to put money down it won't be as simple as plugging in an RCA cable! The ECU will likely need configuring to
output the correct information to the display unit.
Alternatively there's Link's own DisplayLink though their website isn't working at the moment. It plugs in direct to the ECU and gives readouts
similar to the PFC commander.