Can you tell if you have the necessary hardware for a tach? The sensor, from balancer to fender mounted amp to dash. That may help in determining weather or not it had a tach from factory. I understand Euros came without. A friend has a '79 nonturbo Euro CD, same cluster deal. He is wanting to hook up a tach, and has installed a cluster. Front leak could be from windshield rubber, I had an '85 that leaked on my left foot whenever it rained. Rust is usually fatal. Low ball, and see what happens.

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83 SD

84 CD