sensor wire sizes

[Rosey1968]

I cannot spend the cash on a full engine wiring harness so in this time of confinement I am going to rewire these sensors myself:
IAC
TPS
Temp Sensor
Crank Sensor
cam sensor

I plan on replaceing all the wires starting at far back as I can in the harness.

Most of the wires look like AWG 18... does that sound right? I do not yet have a wire guage (one is on order) but if someone knows that would be helpful.

I have already purchased all the weatherpack tools and supplies to do this... I just need to find the right wires sizes need so I can get all the correct wire sizes on order.

Thanks.