Right - I think this has been done by Matt s for the oem tpms System (rdc) but this is a nigmare to find parts and the sensor need changing every 3-5 years when batteries die. So I am looking at retrofitting the rpa tpms offered also on the e38/39/53 which works out the amount of wheel rotations compared to the other wheels as to work out of pressure is low.

Firstly will this work the same being a 4wd rather than rwd?

Secondly can anyone see a problem with me doing this:

http://www.bimmerboard.com/forums/posts/179456 Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

have you thought of taking the easy route and getting something like this for £20,

https://www.ebay.co.uk/itm/UK-Wireless-Sol...Swi7Vb645K

Haha I did but I don’t like lots of extra boxes 😂 it’s bad enough with a dash cam. My Knowles of how 4wd is the only thing holding me back from the gamble I really just want to know if if a wheel was flatter than the other three it would spin faster like it would on the Bmw red cars? I appreciate in lo ratio it probably wouldn’t but not sure with normal use. Also I believe the m5 was the first e39 to use dsc (like the ff) instead of asc hence why I think I can make this happen. If you look closely enough you can get for less than £60 Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

thats to techy for me

its just another piece of to go wrong,
its quite easy to know when your tyre has a puncture

its usually the flat bit at the bottom

Avoid TPMS if you can. they corrode adn give false readings and are a PITA generally. Another bit of nanny state kit for fools who can't do basic upkeep and maintenance on their vehicles.

yep, had two cars with TPMS and both a royal PITA.
Just buy a good pressure guage and keep it in a cubby hole. 2007 Vogue TDV8 in Zermatt Silver with Charcoal

Personally I think they are a pain, with mine if you went over a bump the warning light kept coming on, so in the end I turned the facility off, happy days .
NB: I have always checked tyre pressures on my cars once a week.

I retro fitted TPMS to my car after I drove over a mile on a flat without realising That episode cost me a new tyre, so I went to Steelmate and got one of their systems. It gave me a constant readout of tyre pressure and temp in each wheel, it was so sensitive you could see the pressures increase as you drove the car!

Having spoken to the chaps there, I went for the traditional in wheel sensors, as the cap type ones don't like pressures above 28ish, and I was running my rears at 40.

I could never see the logic in the factory system that just told you when a tyre had gone down..... which one... well you've got a one in five chance of getting it right.....

My system could even take extra sensors for your trailer, but I never tried that one as I changed my trailers several times a day!! Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!

I’ll try and answer most points I only want it as an indicator really - I run 22s with low profiles so it is not quite as obvious as if you run big fat tyres, especially if your in a muddy puddle like this time of year. The fact that the valves etc rust as well as don’t last forever put me off the pressure based kit. The kit I want to put on called RPA(e39 m5 kit) works out by wheels revolutions if it’s lost pressure or not. It does not say which one as mentioned however even if it did my reaction would be the same get out and blow some air in the tyre unless it’s pnctured big time, I just need to check all four - small price to pay in my eyes. Has anyone ever had the more simple system before? I have it in my m6 and it works for what’s I need... Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF