I installed this tach on a 2007 Toyota Yaris with manual transmission. Connection was simple, involving only 4 wiring connections (red wire to 12 volt "+" at ignition switch, black wire to chassis bolt under dash, white wire to dashboard lighting circuit, and green wire to Tach Signal wire at OBD-II connector). Product does not come with wire taps, you have to buy your own or use wire nuts or solder the splices. The tach mounts via a 1" square, flat pedestal that has holes for three #8 sheet metal screws, or you can use the included double-sided adhesive pad.The movement of this tach seems to be very smooth and precise. At $68, it is twice as expensive as the equivalent Sunpro tach, but I wanted full scale of 6000 rpm, not the 8000 rpm that was the only type offered by Sunpro, so I went with this unit. Build quality seems very good, consistent with the $68 price.The instruction booklet for connecting the tach is not very detailed. The instructions suggest...