No need to weld the filter, the filter is docked with car inst ent plug and socket.Simple and efficient operation, safe and reliable.Support models: For all series ID7 inst ent.As we know ID7 dash is from G series , and no tool can change - of G series IMMO Module.After you Modify ID7 dash Milage, and install on car, the Real Milage Sync from IMMO Module This filter function is: When you change the - of the ID7 odo-meter, the filter ,prevent the real mi-leage Sync from IMMO Module synchronizing with the mi-leage of the ID7 meter To stop the mi-leage from BDC2/3, not to show in inst ent.Notice:1. This Product is NOT for ID7 dash Mi-leage KM Frezen or stop Mi-leage, please notice before you buy.2. Solve ID7 dash dark screen issue!The Compatibility Is Just For Please Compare The Part Number With Your One Before Purchasing!Note:Installation guide not included, we strongly recommend you professional installation.Please check as much as possible to make sure the item is what you need.There are some differences between the actual product and the picture due to different batches, which not affect normal useColour:blackMaterial:plasticPackage Contents:1 x ID7 Special FilterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.