Depends on what you currently have and what your going to replace them with , the new guages you choose for example may be very well compatible with your current senders ,eg if your installing a new 80 psi oil guage to replace and 80 psi guage for example, you'll likely be OK Tom
So Tom I have a feeling I should just be calling you and placing an order! I just know it's going to be an expensive one! There is few things I need and a few that I just want haha! I'm just trying to save up my money as I just bought my motor!