There is one other thing that you may want to consider. Most electrical tape is crap and when used on car wiring the ends usually come loose.
The best tape I have ever used is called, "Silicone Fusion Tape" by GB (Gardner Bender) and I've been getting it at OSH (Orchard Supply Hardware). There is no adhesive, it simply bonds to itself. It isn't even sticky like friction tape.
I have other tapes that are supposed to perform in a similar manner, but they don't.
This product doesn't have cut edges like other tapes. The clear insulation between layers is about one inch wide, but the tape is 3/4 inch. Both sides are feathered, almost as though it was poured onto the insulation, before it was rolled up.
A bit pricey at $6 for a not very big roll. Package doesn't say.
The package says: insulates to 15,000 volts and weather resistant from -85 F to 500 F.
I just found this stuff a couple months ago and so far has performed incredibly well.
It's about $6 for a not
