Two questions.

Bought new aftermarket electric oil and temp gauges. Instructions say to use 18 gauge wire. I don't have 18 gauge wire but have all colors of 16 gauge. Will using other than 18 gauge wire cause problems with accurate readings?

If the answer is yes it will be a problem, can I use 16 ga. for ignition and ground, but 18 from senders to gauges without problems?