craigc
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I've moved forward with the MPU route, I believe in the KISS method and I know they work well and will be very easy to install. I did consider a optical RPM sensor but I could not find one that had extended operating temps, just 0-to something Celsius with a operating voltage of 10-30 VDC. Putting a device that isn't guaranteed to work from say -30 to 120 deg Celsius is asking for trouble. I'm a permanent resident in the US and was born and raised in Canada. At my age and experience working in the oilfield from the Arctic to the 60th parallel I've had the "pleasure" of working with equipment that wasn't designed to operate below 0 C.The military has been using MPU technology since the 80's. The bugs are worked out of it. The only problems encountered, are normally dirt and metal filings. All other problems are user caused. Screw in the mag pick up to far, need a new one. Screw it out too far, won't work. Since the first time I saw a the MPU system installed, say 1985? I can count the number of mag pickups that have gone bad, on one hand. It simply doesn't get any easier then MPU for speed control, starter cut out and any other function of MPU technology. The holes between the teeth on a flywheel would have to be incredibly large, for the MPU to not function. Even in the flywheel is stopped, it wouldn't make a difference. The signal isn't being read by any component until the engine starts, or runs. Its a good system. I wonder why its not being used already on 831's?
Here's some good info on MPU selection and installation that I used to find the correct MPU.
http://www.dieselduck.info/machine/07 controls/magnetic_sensors.htm
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