i am putting the 4th gen gauges in a 91 z28 tpi.... the 98 gauges are from a v-6 camaro. i understand the speedo will work and all other gauges will also but the tach needs a 4 cyl tach pulse.. is there any way to calibrate the gauge for that or do i need to get a box from dakota digital or something. if i can get it calibrated does anyone know where it can be done.. thanks in advance.