I have a fcv 295 and gp1971 f as I know I they can be wired together but how this is what I’m looking for, any body can help how to wire this two unit together????
You are going to use white (+) and blue (-) off of the GP1971F. White will go into pin 3 and blue will go into pin 4 on the FCV295.
If you want to bring NMEA0183 data from the FCV295 to the GP1971F, you will use yellow (+) and green (-), yellow into pin 1 and green into pin 2.