smokingness69
Registered
i am looking for a system that can give me an accurate mph reading and was wanting to know which one most of you out there prefer or which one is more popular. ive seen the yellow box but i hear the gps systems have more info. also i was looking thru a jc whitney mag and saw an item that is used for autos but anyway you stick it to the windshield and it can measure hp, rpm, mph, 1/4 times and other stuff. anyone ever used this.