| GROUP BUY: SpeedChanger (Speedo/Tach Calibration Device) 
As many who have changed tires/wheel sizes and/or rear end gears know it can be extremely frustrating living with the speedometer not displaying accurately. While this may be acceptable to some I am like many of you very particular about my Z! Up to this point there have really only been a limited number of ways to address getting the speedometer to indicate the actual speed. 1. Change the speedometer pinion gears in the transmission to NA ones. This works well of course for those of you with a Twin Turbo that swapped out your rear end for an NA one but for those of you that have installed the 4.10 rear end gears from LeaderGears.com this will not result in an accurate reading since the NA gears are not the same numerically as the LeaderGears. This is a reasonably simple solution as long as you have a manual transmission. Sadly the NA speedometer pinion gear swap for automatics requires custom fabrication of a mounting washer. Even with this solution the indicated MPH will still be off as it is designed for the NA gears. On top of that unless you install the NA speedometer pinion yourself you have to add in the labor to get it done by a shop and you still won't have the flexibilty that the SpeedChanger provides. 2. Take your Z to a speedometer calibration shop. Good luck with that one! If you are lucky enough to even have one close to where you live it is more unlikely that they have no experience with 300ZX's. 3. Live with it and know that when the speedometer is showing X MPH you have to subtract Y for your actual speed. Not IMHO a good solution. Add to the above the possibility of throwing off the indicated MPH due to non OEM wheel and tire sizes and the frustration grows. Having upgraded my Z with LeaderGears.com's 4.10 gears I had been searching for a better solution and after 3 months of research, including during which time I also tried the Stillen Speedo Calibration Box which sadly was not an acceptable solution, am glad to say I have found it! Installation is extremely simple and removal of the speedometer is not required and may be reversed at any time in the future!
-Disconnect battery negative terminal (safety first!)
-Remove gauge hood hood (two screws)
-Remove electrical connector to speedometer
-Cut VSS (Vehicle Speed Sensor wire)
-Splice in the SpeedChanger (it is designed such that it is impossible to do damage and further includes led's to indicate if a fault in the connections is detected)
-Run switched + to the SpeedChanger
-Run ground to the SpeedChanger
-Reconnect negative battery terminal
-Replace gauge cluster hood
-Calibrate via potentiometers. Many ways to do this, easiest being following a friend while they set their cruise control to 60 MPH. Alternatively find a friendly law enforcement officer with a radar gun to clock you. by Terf is an incredibly well engineered product that provides the ability to calibrate the speedometer and much more. Here are some of the things you can do with the SpeedChanger: 
Easy To Use HUMAN READABLE Adjustments - No Lookup Tables or Dip Switch Settings!
Calibration Ratio Range from >13:1 to 1/99:1 or .010101:1.
Can be Used to Reset or Modify Transmission Shift Points, Active Steering and Other Speed Related Systems.
Compatible With Any Speed Sensor or Speed Signal Without Adjustment!
Rugged Output Drives Virtually Any Electronic Speedometer!
Indicator LED's Confirm Input, Power & Output Signal Functions Making Your Installation & Trouble-Shooting A Snap!
Designed to Exceed OEM Automotive Specifications for Temperature, Vibration, Electrical Spike & Short Circuit Protection.
Want to convert a JDM speedometer to MPH or vice-versa? Can be Used as an English (MPH) to Metric (KPH) Converter for Your Existing Speedometer.
Designed to be used for On-The-Fly Speedometer Ratio Changes for 2 speed gearbox & differential assemblies (typically used in heavy trucks).
Easy to Readjust for Seasonal or Multiple Sets of Tires.
Built-In Test Oscillator Helps in Installation & Calibration.
No Output When Sitting Still Preventing Your Vehicle From Logging Undue Mileage.
Good For Engine Control, Cruise, Transmission Control, & Electronic Speedometers.
Only 2.25" X 2.5" X 1.0" & Very Easy to Install - Includes Complete Documentation. (Click for manual in PDF format).For this GROUP BUY here are the details:
Normally priced at $149.95 if purchased directly, with this Group Buy once five orders are reached the price will only be $134.95 each! If you are interested send an email to me at kennywest@nc.rr.com and make the subject line "SpeedChanger Group Buy"
To get this started you will need to paypal a deposit to me for, $65.00. I will not withdraw the paypal funds until there are 5 or more confirmed buyers. Once this occurs I will email you confirmation at which time you will then paypal the remaining owed plus shipping. If the group buy minimum of 5 is not met you will have your choice of purchasing at the regular price, receipt to be provided as confirmation, or being refunded your down payment. Once the group buy minimum is met there will not be any refunds as the product will have already been ordered. NOTE! This product is not limited to use on the 300ZX as it can be used on virtually any vehicle that has an electronic speedometer! Got questions? Let me know!
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Want to see progress of my Z's renovation that got it to where it is today? Click here! Check out my parts for sale and parts I need! Got any RED interior trim pieces for sale? Let me know! 
"Inaugural Member; Old geeZers Club"
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GROUP BUY: SpeedChanger (Speedo/Tach Calibration Device) - 
