Dakota Digital has created an interface module that pulls engine data from the Holley ECM and displays the info on the gauges. You can install this digital instrument cluster by either wiring the control box to the vehicle or you can minimize the wiring needed by using this interface module. Dakota Digital has done an incredible making these gauges look like a factory option at first glance. They make gauges for all kinds of vehicle in the automotive, motorcycle and off road industry. Visit www.dakotadigital.com to see what they have for your project. Parts Used: RTX Gauges - https://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=1137/category_id=-1/mode=prod/prd1137.htm Holley EFI Interface Module - https://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=1105/category_id=-1/mode=prod/prd1105.htm Contact the builder: YT - @yeahbuddygarage FB - Yeah Buddy Garage IG - @yeahbuddygarage TikTok - @yeahbuddygarage Magazine Subscriptions! Street Trucks: IG - @streettrucks FB - www.facebook.com/streettrucks Magazine - https://engagedmediamags.com/automotive C10 Builders Guide: IG - @c10buildersguide Magazine - https://engagedmediamags.com/automotive OBS Builders Guide: IG - @obsbuildersguide FB - www.facebook.com/groups/obsbuildersguide F100 Builders Guide: IG - @f100buildersguideofficial Magazine - https://engagedmediamags.com/automotive