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The Commander 950's ECU must be mounted inside the car to protect it from the elements and to make it easier to hook it to the laptop computer. We mounted ours on the floor, right next to the B&M Pro Ratchet shifter and Auto Meter Ultra-Lite water temp and oil pressure gauges. Make sure to double check each and every wire connection. We spent an hour trying to figure out why our laptop wasn't getting a signal from the ECU, only to discover we didn't have a fuse in the wire leading from the Holley Pro Strip Annihilator ignition to the ECU.