Quick question for those who have relocated their battery..

[Jezza_hr]

Where did you find to be the best ground points in the boot?

Since relocating my battery and going back to my standard tachometer on my OMEX, I am seeing erratic readings when the battery is under load from ancillaries such as the indicators and electric windows. The needle jumps up and down without any change to the engine's idle itself.

Speaking with OMEX, they believe it is due to bad earths, but having gone over them and my battery now getting a steady 14.5v when the engine is in use, it appears the ground wires are in a good spot. But I want to ground the car even further to see if this solves the issue, but I'm trying to choose the best spots. Any ideas?