Dial-type tire pressure gauge (can no longer read the stick kind) and a cheap portable air compressor. Paid for themselves the first time I didn’t have to drive

Dial-type tire pressure gauge (can no longer read the stick kind) and a cheap portable air compressor. Paid for themselves the first time I didn’t have to drive to the petrol station on a nearly flat tire. The long flimsy power cord and having to use it with the car running is an annoyance, might have to look at a cordless one next time.