The materials of the guide plate for automobile timepieces usually include the following:

1. Aluminum alloy: Aluminum alloy is a commonly used guide material for automobile timepieces, which has light weight and good corrosion resistance. The aluminum alloy chronograph guide plate is usually treated with surface treatment, such as anodizing or spraying, to improve its durability and appearance.

2. Stainless steel: Stainless steel is a kind of material with excellent corrosion resistance, which is suitable for manufacturing the guide plate of automobile timepieces. Stainless steel chronograph guide plate has high strength and durability, and can maintain good appearance and performance for a long time.

3. Plastics: Plastic-made guide plates for automobile timepieces are usually made of engineering plastics, such as polycarbonate (PC) or polypropylene (PP), which are light, wear-resistant and corrosion-resistant. Plastic timepieces guide plates are usually used for low-cost vehicles or vehicles that need special design.

4. Carbon fiber: Carbon fiber is a light and high-strength material, which is suitable for the guide plate of automobile timepieces that require high performance and appearance. Carbon fiber chronograph guide plate has excellent strength-to-weight ratio and tensile strength, which can improve the sports performance and appearance of vehicles.

5. Fiber composite material: Fiber composite material is made of fiber and resin, which has light weight, high strength and corrosion resistance. Fiber composite chronograph guide plate usually adopts carbon fiber and glass fiber as reinforcement materials, which has excellent performance and appearance effect.

To sum up, the materials of the guide plate for automobile timepieces mainly include aluminum alloy, stainless steel, plastic, carbon fiber and fiber composite materials, etc. Each material has its own specific advantages and applicable scenarios, and the appropriate material can be selected according to the demand and budget of the vehicle.