I installed a UMA 2 1/4" MP gauge in my KR when it was new. It's currently $159 Aircraft Spruce Part # 10-11250. I use it primarily for fine tuning the throttle settings at altitude. It's just another tool for monitoring the engine performance. Seems to me that I used a primer nozzle to tap the manifold to keep it from leaking too much in the off chance the line to the MP gauge failed, broke or fell off.
-Jeff Scott Los Alamos, NM > > Off and on I've looked at the Stewart Warner gauge, 2.25 diameter. It's > my current choice unless I come across something better. Van's sells one > that looks better (appearance), for about 30% more than the SW. But > reliability reports on it and other Van's-branded & sold instruments are > not generally good. There's some other relatively inexpensie MP gauges > in the car world that look colorful and might work but staying away from > that. I've got a useless vacuum gauge I want to replace with an MP > gauge. > > Appreciate any pointers or thoughts about the subject or if anyone has > something for sale let me know please. 2 1/4 hole. Doesn't need to be > lighted. > > Mike > KSEE > Laser147 at Juno.com
