[Tremelune]

i will just drive her in 3rd gear and use reverse gear i have been looking at a Thunderstruck vcu

You're fine either way! All you need to engage reverse with the Thunderstruck VCU is a switch to change from forward to reverse. If you want to trigger the reverse lights, you'll need a special relay that can trigger a 12v circuit with a 5v signal (I found one on Amazon for US$5).