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I recall seeing this item on ebay a few years ago. Extends the seat track several inches for taller drivers. Anyone know where it can be purchased?

The tach in my car has recently started to "jump" at idle. I mean that it  quickly fluctuates 500 rpms up and down without the engine speed changing. Once the idle speed is increased, the  jumping stops and it appears to read accurately. ANy idea what could cause this.