Merge counter data with analog data

Greetings,
I need to measure a variety of analog signals and RPM signals and save the data to a file. I had intended to use counters for the RPM signals. The problem is that the counters use implicit timing which is totally asynchronous to the ai sample clock. Therefore, there is no time or sample correlation from the counter data to the analog data. I would like to merge the counter data with the analog data into a waveform array. Does anyone know of a method that would allow such a merger?
Phillip Neir
GM Engineering

Thank you for your response. I understand what you are suggesting and have used that technique before for displaying data. The first, and foremost, problem is that there is inherently no timestamp and no regularity from most frequency/period measurements. Thus, there is no time relationship to other channels. I was hoping for a technique that would synthesize a waveform from asynchronous, non-regular data that could be related to other waveform data. This may be an insurmountable problem and I may just have to revert to frequency-to-voltage converters.
Phillip Neir
GM Engineering

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