We are shooting for a very fair mark I would say ballpark $300 to $400 for 3 gauges, If you want to go aem, we may just sell the overlays, The cheapest AEM gauge I found was $170 lol and it is the clock. It all comes down to what you want be able to do and read with your gauges. I had no Idea until I searched that you can spend about $800 for 3 wide band gauges. The AEM are easy enough to put together yourself, where as these take a lot of work. These do the same job, you just cant plug your computer into them and tune your engine off of the information.