I think a line carrying nothing but 12V is "ok" to crimp I.E. relays, power on/off, etc.(always better to solder)...but if it sends an alternating current, like all of your sensors...those HAVE to be soldered, or the readings may differ and your car won't run as well. the battery relocation can be crimped into the harness. Main thing is don't use too small of a gauge wire...its better to use a 10 gauge if you're not sure a 12 will carry the current without burning up. if you crimp a wire and bundle it tight...it should last forever. Use dialectric grease so corrosion doesn't ruin you're solderless connections.

A soldering tip, if you don't already know...hold the iron at the bottom of the wire, and the solder at the top...wait till the wire is hot enough so that when the solder hits it, it liquifies...thats worked for years of electrical repairs for me.