One of the problems of buying internet and not over the counter and living in a rural area is, my AFR DM5 gage from PLX is defective and I have to send it back for repairs and they are three weeks behind on repairs and don't answer the phone half the time, I will never use them again, but I am stuck with them now, for no refund is offered and I will also discuss this with RETROTEK speed as it is the AFR system they use, just a word of caution, I would use another brand for AFR in my opinion.