Gas gauge calibration unit

I have been busy on an engine rebuild project. I am getting closer, I got carried away working on heads for about a week. I forgot how long it takes to do valve job, and balance combustion chambers. I hope to install in a couple days when the weather warms up.

The unit was completed 2/6/14. I did a few calibrations for various sender resistance ranges and gauge current requirements.

My next step is to box, and send out for Del to try. I need to make some documentation for testing/calibration procedure. It has been long enough it will be all new to me again. I will test one more time, to check the documentation.