switched GPs to button but wired like factory
 

I put a button in to control my glow plugs, I wired it into the fatory setup, just got rid of the timer wire, and I just tapped into the WST light works like a dream, but everybody tells me that bosh are best for that setup, but Then everybody says beru are beter for the controller, I have the controller but it just works off a manual button. I think I'll be fine with Beru?