Best you power it from power source tied to the ignition and plug it into the OBDII port with one of these ........
This part number is a Haltech reference: HT-06-280-CA-EFIOBDI
http://www.haltech.com/haltech-dashes-data-logging/ and scroll down until you find the part number
This part number is off the RACePAK website: 280-CA-IQ3S
https://store.racepak.com/product/iq...-dash-harness/