--- title: Hardware Installation Guide — Teltonika FMC640/FMC650 Remote Tacho Download description: Step-by-step guide for installing the FMC640/FMC650 Remote Tacho Download plug-and-play cable, including tachograph removal, cable harness connection, and port C termination wiring. --- [Skip to content](https://support.gsfleet.io/knowledgebase/teltonika-fmc640/fmc650-remote-tacho-download-hardware-installation-guide#main-content) [![](https://support.gsfleet.io/hs-fs/hubfs/gsfleet-logo-full-color-rgb-1271px@72ppi.jpg?width=1271&height=252&name=gsfleet-logo-full-color-rgb-1271px@72ppi.jpg)](https://gsfleet.io/) - [Home](https://support.gsfleet.io/knowledgebase) Open main navigation Close main navigation - [Home](https://support.gsfleet.io/knowledgebase) - [Contact us](https://www.gsfleet.io/en/about-us/contact-us/) [Contact us](https://www.gsfleet.io/en/about-us/contact-us/) How can we help you? - There are no suggestions because the search field is empty. 1. [GSFleet Knowledgebase](https://support.gsfleet.io/knowledgebase?hsLang=en) 2. [Devices & Hardware](https://support.gsfleet.io/knowledgebase/devices-hardware?hsLang=en) 3. [Teltonika Installation Guides](https://support.gsfleet.io/knowledgebase/devices-hardware?hsLang=en#teltonika-installation-guides) September 29, 2026 # Hardware Installation Guide — Teltonika FMC640/FMC650 Remote Tacho Download Step 1 - Remove Tachograph Using the tacho removal tools (not supplied) ![](https://support.gsfleet.io/hs-fs/hubfs/image-png-Sep-29-2026-01-11-11-8866-PM.png?width=372&height=167&name=image-png-Sep-29-2026-01-11-11-8866-PM.png) Step 2 - Remove all vehicle’s plugs from the rear of the tachograph. ![](https://support.gsfleet.io/hs-fs/hubfs/image-png-Sep-29-2026-01-11-19-0812-PM.png?width=436&height=289&name=image-png-Sep-29-2026-01-11-19-0812-PM.png) Step 3 - Install Teltonika device. Find a suitable location for the Teltonika device that will not interfere with or affect re-insertion of the tachograph. Place antennas away from the tacho wires. ![](https://support.gsfleet.io/hs-fs/hubfs/image-png-Sep-29-2026-01-11-27-0749-PM.png?width=377&height=227&name=image-png-Sep-29-2026-01-11-27-0749-PM.png) Step 4 - Connect vehicle’s plugs into the sockets on the cable harness. ![](https://support.gsfleet.io/hs-fs/hubfs/image-png-Sep-29-2026-01-11-35-4480-PM.png?width=382&height=223&name=image-png-Sep-29-2026-01-11-35-4480-PM.png) Step 5 - Re-connect the tachograph. Insert cable harness plugs into tachograph. (connector A – white plug; B -yellow plug; C - red plug; D \- brown plug) Slide tachograph back into position - ensuring that cables are not pinched or trapped. ![](https://support.gsfleet.io/hs-fs/hubfs/image-png-Sep-29-2026-01-11-44-4283-PM.png?width=445&height=268&name=image-png-Sep-29-2026-01-11-44-4283-PM.png) NB – Termination If the Teltonika device is the only device connected to port C, keep the termination connection. If the port C is shared with other devices, cut the termination wire. 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