Gauge Size Up Kit. The manufacturers standard gage provides the thicknesses for standard. By gradually increasing the number of tape layers over the course of the next few days the gauge of the plug can be increased.
Autometer Prestige Series Pearl 5 Piece Gauge Kit projektsik1store.com
This may not seem like a lot but it makes a difference in size! Gauge sizes go up (or down. depending on how you look at it) in even numbers from there. so the next largest size from an 18g is 16g. then 14g. then 12g. and so on. 2 gauge buy 2 gauge wire.