arcom
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I've been running the Classic Speed gps mod for about 18 mos and several thousand miles in my TR6. My original problem with speedometer accuracy was similar to the OP's....at 70 mph indicated I was actually travelling 81 mph while at 40 mph indicated, the error was only 7 mph, i.e., I was actually travelling 47 mph. With the installation of the Classic Speed, my maximum error is -3 mph at an indicated speed of 70 mph. In other words, when the speedo says 70 mph I'm actually travelling 67 mph. Between 35 and 55 mph, the speedo is spot on. Certainly acceptable for me.
I have not encountered any gps drops while travelling under long overpasses, alleys or on roadways covered by overhead foliage. One place I have not tried is in a tunnel, although the software in the Classic Speed is supposed to maintain the gps readouts when driving in tunnels.
Installation is easy. For me, they hardest part was removing the original speedometer cable from the gearbox connection. If the thought of removing the speedometer and either sending it out for a recal or fiddling with it yourself is too daunting, the Classic Speed is a great alternative.
I have not encountered any gps drops while travelling under long overpasses, alleys or on roadways covered by overhead foliage. One place I have not tried is in a tunnel, although the software in the Classic Speed is supposed to maintain the gps readouts when driving in tunnels.
Installation is easy. For me, they hardest part was removing the original speedometer cable from the gearbox connection. If the thought of removing the speedometer and either sending it out for a recal or fiddling with it yourself is too daunting, the Classic Speed is a great alternative.