pick up your 12 v power at the accessory plug behind heat plate on steering support hoop on pto side and pick up your tach signal from purple wire closest to ecu....you need three wire dc harness for 07...tons of help and info in the instrument swapmeet section of this forum...digitron has a thread you go to and Mark from digitrondirect or go to there site direct and there is a wiring help section...personally i had digitrons and l got the dual Kosos and i find the Koso a way better guage..not overcomplicated with options...does the job its intended and does it well...!!!..snowjw on this site sells them..