On my 87 300e I discovered the outside temp sensor was cut off. Even though the cluster end of the sensor from my totalled 91 300e is not interchangeable, I cut the sensor end off the 91 300e & attached the wires to the same-colored leads on the 87 300e, expecting it would work. However, the lcd reads sporatically, and it only reads 125F when it shows anything. Did I do something wrong, or doesnt this work? Thanks.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)