I just bought Speedhut gauges, and I need to know if I'm limited on what specific wideband controller(s) I can use. The AFR gauge is the GR-AFWB-03 for NGK. So, can I only use an NGK wideband controller? If so, is my only option the AFX Powerdex Wideband Air-Fuel Ratio Monitor or is there a cheaper one that is compatible/available on the market? Thanks in advance!