I have a question for the wizards. I have a magneto on my pro stock boat engine with an internal coil. Can I run an electronic type of tachometer (Autometer) off of the mag with the internal coil or do I need a mag with an external coil to make it work? There is only the kill wire coming out of the magneto. Would this wire give me a signal for the tach? eh
Any help would be appreciated.
Thanks in advance.
Paul
Paul, here is a pic of what you need. Small converter box for a mag. I've only used them on Vertex style mags, so may want to check with AutoMeter before buying one. Jocko
I checked on the tach adapter and they state that they are for external coil type magnetos. There is a device called a"Tach drive pulse signal generator" that may work off the V drive or off the cable dive off of the magneto.
Thanks for all the help
Paul
At one time Autometer sold a 10K tach designed for the Vertex type magnito, and they had a memory... There are still some out there, likely laying on the shelve of someone that went to a more modern type ignition, or an external coil type mag... I know I have an extra one, but sadly, it isn't for sale.... Check an old Jeg's or Summit catalog for the number and then start asking around. And yes, the tach signal comes from the one wire that is also the "kill" wire to ground....
Ray, thanks for the info on the older type of tach that runs off of the kill wire. I thought that they were around some time ago. I will try and locate the partnumber and put out some feelers to see if someone just happens to have on as you say " sitting on the shelf".
Ray is right on that AutoMeter tach specifically made for a mag. I had one that went ON/OFF of the shelf for several years as I went thru the boats of my life, lol! Finally, an Australian guy convinced me he REALLY needed it more than me.....so off it went. Wish I had it back now!
Jocko
Sorry if the link doesn't work. Joe Hunt has a magneto converter listed for use with ALL there magnetos. It can be found under accessories. Joe Hunt Tach Signal Converter - Joe Hunt Magnetos
Hope that was what you wee looking for.
John
OR
if you have a flying magnet -- you can use an MSD 2348 hall effect sensor on it and generate a tach signal that is completely independent from the magneto. This is what I do because I run a datalogger and it doesnt play nice with the mag.
Heres a little test I did with the hall effect
Way cool!! Now I have a couple of options.
Thanks for all the help
Paul
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