Got an old Dakota I’m fixing up, decided to see how off the speedometer was, so I downloaded this. When I downloaded it, inside, standing still, I was going 3.6 MPH.
Decided to let it calibrate a bit, let it run for about 5 minutes. Started reading accurately. Set it up on my dash so I could do a side by side comparison. I take off from a parking lot. My truck reading 7 MPH, SpeedTracker 15. I turn onto the road with a 25 MPH speed limit. I match it with my truck, SpeedTracker? 40 MPH. I took a detour for one stop sign, and it seemed to adjust to normal when I started slowing down. Instead I took off at about 2K rpm, enough to make it move with a jolt. Same 25 speed limit, but this time when I took off hard, SpeedTracker said 60. And continued to read that.
Turning onto a 55 Highway, I slowed down to about 30 turning onto it. I get up to 55, like a normal driver. Take a guess what SpeedTracker said? 90.
Last thing is I go up a steep hill, push 4K, going 60 on my tach.
SpeedTracker reads 105.
Do not download. Needs serious calibration