[F500] Rotax tach lead

[John Engstrom]

Jeff,

I hit 6800 RPM and the dash read the RPM just fine.  I'll let you know
if the gauge reads up to 8000 after our next event this coming weekend.
Do you have the black kill wire running next to the coil or anything
else that might cause interference?

John Engstrom

-----Original Message-----
From: f500-bounces+engstrom_john=hotmail.com at f500.org
[mailto:f500-bounces+engstrom_john=hotmail.com at f500.org] On Behalf Of
Jeff Blumenthal
Sent: Tuesday, April 19, 2005 9:06 AM
To: f500 at f500.org
Subject: Re: [F500] Rotax tach lead

John,
   Did you get a chance to test over the entire RPM range?  I had 
difficulty last year when installing the MyChron3 to my Rotax. The tach 
would work fine in the low RPM ranges (up to approx 5000) but would then

blank out in the higher ranges. I'm pretty sure it's because the voltage

is too high. I never did get it figured out before the season ended 
(yeh, we have snow up north).  I was getting help from Mario at AIMsport

in CA.  Now that the snow has melted, I'll be tackling that problem
again.
-Jeff

John Engstrom wrote:

>Never mind - I figured out my own dumb question. :-)
>
>I searched the archives and found the tach lead I needed to hook up to
>is the same as the kill switch - the black wire with the white stripe.
>It produces 65 volts AC and even though I'm running a MyChron which
>expects a max of 50 volts it works.  I even asked the vendor I bought
>the gauge from and they said I wasn't going to hurt the gauge running
65
>volts to the line that expects 50 volts.  The vendor even went so far
as
>to tell me if I fried the gauge I could send it back to them and they
>would repair it no charge (no pun intended).
>
>John Engstrom