install is easy i did mine pretty fast. you need to run a better wire splice the one they give sucked and lost power to the unit... turned off my speedo and odometer OOPS lol but i turned around and went back home and fixed it so i lost like .3 miles

with a better splice its good to go. and you dont need to put in a new speedo gear the speedcal is designed to take the stock gearing and alter it for the new gears.
__________________
2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq