I have a 1995 Impala SS with a 6.0 LQ4/4l60E swapped in it. I'm also running a gauge cluster from a 1995 Camaro Z28. MY problem is that my speedo is showing 2.875x what my speed actually was (i was doing 40 according to HPTuners, but it reads 115 on the speedo). I've also logged it with the GPS and HPtuners and my GPS are within ~1-2mph of each other. I've looked at a few different stock tunes (06 Savanna Van, 03 Silverado, plus some others), and I've noticed that they have values plugged in under the shift light gear ratios table, whereas my tune (modified 04 GTO tune) does not have them. Would this affect how the speedometer reads?