Currently, my new AEM Serial gauge is grounded on the drivers side with my boost controller on separate rings on a common bolt into the chassis. When I add the LC-1s, I'm thinking of setting up something like this since their leads will ultimately wind up on the passengers side near my EMS:
I would then reroute the grounds for the gauge/EBC to that block instead of the common bolt on the driver's side. The terminal block would then be grounded on the engine block. That way, all the devices have a common ground that should yield pretty consistent grounding I hope :)
