ST165 wiring aftermarket devices

Hello. I have a 2 4th Gen Celicas. One is my ST165 and the other is my swapped ST162 (GTS). We all have aftermarket devices tied into the ignition harness like gauges, turbo timers, alarms, and etc....

I tapped the ignition harness so many times, its ready to fall apart.

I relocated both batteries to the rear. I have 2 alarms (one for each car) and car stereo equipment to install next.

Is there a way I can create a special box for all the (Power) ignition wires for all my devices to wire into?

You can use a distribution blocks that are using in wiring power for amplifiers. Some of them accept 4 gauge wire. Some of them has fuse inside. I've seen them on Crutchfield. Then you can get the power from either 12V from ACC terminal or constant 12V from battery or both.

http://www.streetwires.com/images/produ ... CBR44M.jpg

this may sound stupid but i am trying to install an alarm and am wondering which wires i need to tap into and where for the starter, ignition and tachometer signal.