When buying performance gauges by such makers as APEXi and others is there anything seperate that you have to buy to make them read. For example say I buy a R1 exhaust temp gauge for 50-60 bucks, however much it costs, does it include all of the necessary hardware to make the gauge work or is there something else that I need to buy. Thanks

 

For A'pexi no... other stuff I have no clue.