Gauge Lights Work

I finished wiring my voltmeter, oil pressure, water temperature and tachometer to the power system of my 1987 Chevy G20 Sportvan.  I tested the gauge lights, I got the power from the headlight switch to work, but the only thing that I got wrong was I didn't do it to the dimer switch.  Oh well.  I'm happy.  I did turn the key to the accessory position and got a low voltage reading.  The instructions for it come with troubleshooting tips.  I didn't want to turn the engine over yet because I still have to install the lines for three of the gauges to the engine.