Spare Tire TPMS

[armabill]

Is there any after market tire monitoring systems just for the spare tire?
The ones that I've seen include the other 4 tires but not just for the spare.

My 2020 4Runner TRD Off Road Premium doesn't have a TPMS sensor on it and I'd like to monitor the air pressure without crawling under the truck.

A small unit that sits somewhere on the dash would be nice.

 

[TK-422]

Nevermind. I thought I had a good option but it only works with certain sensors. You would have to replace all your TPMS sensors for it to work.

I almost bought one since I am replacing my tires this week, good thing I looked in the reviews.

 

[armabill]

I want one that works independently from the rest of the tires, only used for the spare. So far, I haven't seen any.

The closest that I have come is a system for motorcycles but I'm not sure if the sensing systems signal distance would reach the dash.

This is assuming that other sensors send signals on different wave lengths.

 

[Hiker12]

I would also be interested in this - I think it is a great idea.