Having trouble determining frequency from data

I am looking to try to determine the frequency that an object is rotating at.  The data file attached is the measurement made by an oscilloscope as last passes through and opening in this object as it is rotating.  I have attached the vi below.  I am able to get the height and the timestamp for the first peak, but I am having trouble getting the second peak.  If I do array max and min in takes me further down, but has the incorrect timestamp with it. 
I have also tried using the pulse measurement channel vi but every time I try to run that I get a warning saying
So I am looking for a little guidence in trying to get this solved.  I would like to be able to go and determine the height and timestamp of the second peak.  I dont need a vi that calculates the frequency for me, Im fine programming the math.  But if there is something I am missing with the pulse measurement vi, that would make this a lot easier.
One additional note:  Yes I am working in 7.1, I am a grad student and it is a department copy, so no I dont have money to uprgade to a newer version.  So if you could do me a favor, if you do post some programming but can save to 7.1 for me to open and look at can you please do a screen shot.
Attachments:
Time Stamp PD Raw.vi ‏38 KB
T1PDR2.txt ‏928 KB

Take a look at the attached.  It uses the Peak Detection function to find the peaks in your data.
I set the threshold to 80% of the max value and then set the width of the peak detector wide enough to encompass one peak but narrow enough not to reach a second.  I did find if I make it much bigger it misses the one at the end.
Randall Pursley
Attachments:
Find Peaks.vi ‏57 KB

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