Yes I have them, and love them. There is no other guage for me. I got mine from Diesel Injection Service quite a while ago. The prices you find are all going to be within a couple of bucks of each other so pick a vendor that you think will support you and the product you buy. I am looking to get another one, and will buy it from Performance Diesel. In conversations with Nowell and Brandon I think my best bet is to go with PD if I should have a problem. It is about 98-2 that I will not have a problem, but..... By the way, Brandon is THE MAN when it comes to the SPA guages. He has done more of them than anyone else that I know of. Shoot him a PM or email and get his take on it.