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1987 944 Tach Not Working after Engine Swap


Vehicle Information: Model(924/944): 944; Year: 1986; Engine (type, size, modifications): 2.5 L SINGLE CAM; Total Mileage: 125,000;

I replaced my 87 engine with an 86 engine c/w DME and engine harness. The motor starts up except three things. 1. my battery light stays on continuously. 2. my tachometer doses not work. 3. the engine idles to high. can you give me some insight as to what might be the causes.

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