I'm not sure what the exact length is, but it reaches from the ECU under the battery tray into the interior through the speedo cable hole and I attach the hand held under the dash. I would guess it is 5 or 6 feet long.

If you need any more pictures, just let me know.

1968 Valiant Signet 4dr. 273 4spd
1969 Road Runner 383 4spd
1969 Barracuda 318 auto
1970 Dart Swinger 340 4spd
1975 Cordoba 400-4bbl
1988 Caravelle 318 Auto
1999 Dakota R/T
2000 Viper GTS
2001 Ram 2500 Diesel 6spd
2018 Dodge Challenger GT (Winter beater!)