I've just bought a 1964 Karmann Ghia. fitted in 1996 with Talisman 3 immobiliser. The immobiliser works most efficiently, but I only have one key to deactivate it and fear that should it fail, I couldn't start the car. I abhor the unnecessary complexity of modern cars. Can I obtain an extra key for this system? A modern immobiliser would be well over the top for the electrical simplicity of a beetle. I can find little about Talisman other than that the company was dissolved sometime after 1997.