I have a Lavorsi 100 mph GPS speedo. It is the monster gauge and has the black carbon fiber face and the "tattle tale" recall switch, new in the box never installed-$165 OBO. Also have a Garmin 17x NMEA 0183 HVS GPS antenna new in the box never installed-$85 OBO. The speedo is the type that would have required an antenna that has a battery, the Garmin antenna does not require a battery but will work with this speedo. Going through some financial difficulties and need to sell some things.