TPMS - Reference Pressure

Dear All. I appreciate that there have been many threads on TPMS systems. I have read most on ExplorOz plus many others. Initially I was going to post a comparison table on the voiced likes and dislikes of the multiple systems available. Then laziness set in hence this post.

I want to buy a TPMS before we head off on the next big trip and I am interested in your comments.

My interest is in the amount of effort required to adjust the reference tyre pressures for each tyre/sensor after airing up or down. My research suggests that only Sensatyre has a simple system. However this may not be correct.

Whether internal or external sensors the driver has a labour overhead of either removing a valve cap or a sensor cap when airing up or down. So after the "airing" comes the adjustment to the TPMS reference pressure.

It would seem logical that you can set a single base line pressure to which all tyre sensors are referenced. For example:

Let's say the base pressure reference is 20psi and I want to set my TMPS alarm levels to cater for highway cruising. So I end up with.

Tug Front = 36 psi Reference + 16
Tug Rear = 40 psi Reference + 20
Van = 45 psi. Reference + 25

Then a rough bit of dirt is foreseen so air down required.

Tug Front = 24. reference + 4
Tug Rear = 28. Reference + 8
Van = 33. Reference + 13

So in the example I have adjusted all tyre pressures down by 12 psi.

Is there a TPMS around that allows the base line reference pressure to be adjusted by a simple button press or similar. Rather than have to reprogramme each sensor to the new pressures. In the example the reference base pressure would go from 20psi to 8 psi.

I don't wish to start an argument on best tyre pressures for different circumstances. Just want a TPMS that is simple to reset for different tyre pressures. I run 5 different pressures depending on what's underfoot and whether towing or not.

Trust the above makes sense. Always seems to when you write it.

John