Smiths Tachograph Technical Service manual Genuine Smiths Trade Only publication Only available to Smiths Tacograph service centres. An almost imposable manual to find. This Manual Covers Instalation procedures Calibration procedures Sealing procedures Paperwork procedures Mechanical series Tacos SG 20 and SG 24 Single and duel tacos. Taco adapters. Tacograph Ancilliry Equiptment. Flexable Drives. Electric Tacograph Drive systems Instalation and fault finding. Electronic Tacographs Calibration Instalation Part Numbers Ratio Tables Digital Turn Counters Co Efficiancy Operation Illustrated with diagrams. Origonaly strictly for the rade only.