Or you can scrape off all the silicone on the inside of the amp and re-solder as many connections as you can, worked for me. Most people with tach problems have a bad tach amp, that is your best place to start.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth