David P Posted May 14, 2015 Share Posted May 14, 2015 Speedo error correction. Homers thread is very informative. http://www.mkivsupra.net/vbb/showthread.php?225050-Supra-specific-gear-diff-ratio-and-tyre-size-calculator Pop off the Supra speedo needle, drive at 70mph with satnav and pop it back on at 70, then you know it is correct at the naughty line and any error at lower speed will be less. http://www.mkivsupra.net/vbb/showthread.php?322626-Adjustable-speed-converter-delimiter&p=4032403#post4032403 If that's not how you want to do it, this could be what you seek? http://www.jaycar.co.uk/productView.asp?ID=AA0376&form=CAT2&SUBCATID=965#11 Link to comment Share on other sites More sharing options...
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