[Lyle O]

Got my Yellow Box the other day, and installed it this evening. All I can say is YES!! My speedo is now dead-nuts accurate (had to make a 12.4% correction). What a great joy; the speedo has bothered me for years. Install was easy, as Click says above; very intuitive, and easy to program. Only difference from above is that my car is an '87, and the signal and ground wires are different colors from '83-'85 (signal is green, ground is brown). Great instructions to do various diagnostic tests, etc. At $93, it saved me hundreds, I am sure, from having to send to NHS. Thank you for finding this solution, Click. Even my wife wants me to give a shout out to you, 'cause she has heard me complain about it for so long. If any of you have a calibration issue with your speedo (electronic only, though), this is the ticket for sure.