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1. The most accurate tachometer signal can be obtained from the PCM. There is a problem here, though. The PCM output is for a 8-cylinder tachometer, but the tachometer in this cluster is of the 4-cylinder type. I don't know why. The PCM can be modified to correct this problem by adding a circuit to the PCM board that allows the tachometer in the gauge cluster to indicate correctly. PCM programming is not altered. My PCM was modified by Bob Bailey. The cost is $150.00, including normal return shipping. Here is his contact information: |
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Robert Bailey Bailey
Engineering, Inc. |
| 2. A tachometer signal can be obtained from the ignition coil, although I have heard that the tachometer needle can be shaky and erratic. |
| 3. Another alternative is the Dakota Digital SGI-8 Universal Tachometer Signal Interface. Cost is $79.95. I will be installing one of these units with a 96 Impala SS cluster in my 1995 Impala SS. The installation was completed on February 12, 2006 and works flawlessly. |
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Questions? Email me......
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