Permanently Mounted Brake Pressure Gauge

[Elusive R]

Has anyone had experience putting a gauge into brake lines? I'd like to use the gauges to help setup the brake pressures initially, but I'm also trying to plan ahead for the possibility of needing different brake bias setups for autocross, street, track days, etc. and thought having the gauges already installed would ease the process (ie no bleeding everytime to check pressure). One of my concerns is that the gauge won't allow the brakes to bleed properly, though it seems to me that it should be fine. Another concern is that the gauges might cause reliability/safety concerns for a street car. Are these gauges specifically allowed/disallowed by the NHRA or SCCA (or others)?

I'm running a Wilwood dual master cylinder brake pedal and I'm planning on either putting in electric pressure senders (anyone know a good, cheap source?) or two pressure gauges mounted into tee fittings in each line (front and rear). I found gauges like this:

http://www.northerntool.com/webapp/w...=13466&R=13466

or this one with all stainless construction:



http://www.northerntool.com/webapp/w...24&R=200095824

Thanks in advance,
Ryan