Car starts each time it is cranked but dies immediately. Fuel filter is new. Upon investigation the fuel pump cuts off due to the fuel pump relay. If the pins on the fuel pump relay are jumpered the car runs fine. New fuel pump relay did not resolve the problem. Same condition, car starts and dies. The fuel pump relay has a TD input on the electrical diagram. What is this signal and what may cause it not to be present. Also the RPM gauge is not working as it also gets this TD signal. Any help appreciated.

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89, 300SEL
98, E430 black on black