How do I disable aiti-theft feature from 1989 W126?

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68 280SE Coupe restored
01 Audi A8L
05 Volvo XC90 AWD
85 CJ7 (Rockcrawler) GM 5.3 Vortec
02 Excursion XLT 4X4 PSD 700lbs. torque
78 Jeep J-10 4x4 (project)
84 Jeep Wagoneer (donor vehicle)
02 Carson HD Car Hauler

David