It should work just fine with an O-200 engine. The extra line filters are there to fine tune it for various magneto brands.
Only thing is I think the C-150 has a redline of 2750, you’ll have to check on that. The digital readout operates fine at any rpm it’s just that the little red dot will start blinking at you when the RPMs go above 2700. I’ve heard that E.I. can adjust the red dot setting and print out a new face with 2750 on it, maybe for a fee?
Although, you could just use a label maker to print out a new 2750 sticker to cover up the existing 2700. That way you would have the proper maximum RPM placarded on the instrument and the blinking red dot would serve as a warning that you’re approaching redline.
If I was doing a lot of high speed flying at maximum RPMs then the blinking red light might bug me enough to let E.I. make the adjustment. But I rarely run my engines that hard, or at least not for any great length of time ;-) so printing out a new placard would probably do the trick for me.
But again, check out your airplane/engine requirements and see if it’ll work for you.
Last edited by RussellJ; 08/09/25 02:31 PM.
