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S&M Electro-Tech, Inc S&M Electro-Tech, Inc- Manufacture electrical components for classic cars. Tachometer repair PC boards, turn signal switch systems, custom wiring, gauge regulators, AM to AM/FM St… Shanghai Hugong Auto Electric Co., Ltd. Shanghai Hugong Auto Electric Co., Ltd.- Manufacture automotive electric products, electronic component, relay, thick film circuit, controller, electric appliances, auto assembly,… ihr GmbH ihr GmbH- Develops automobile electronics and software with products such as Emulin and LINgate for the development and production of control devices with LIN interfaces.