Just a friendly warning,
If you don't already know this,Neon or Cold Cathode Lighting uses VERY HIGH VOLTAGES!!.
Depending on the size of the sign(s), this voltage can vary from 5kV, up to 50kV+.
The secondary side of the supply transformer
(Step-up), needs to have special silicone HV wire used, this is heavily insulated and I would not recommend the use of any splices
on this side of the transformer.
Be very careful around this sort of equipment and make sure that you lock out all of the energy sources relating to the sign circuit(s), there have been some really nasty accidents over the years, with CC lighting systems, don't end up being a statistic!.
Let's face it, these days if you're not young, you're old - Red Green