There is no hole to place an LED to light up the meter. But the plastic can be easily drilled and one added to the right or left side of the meter. Be careful when drilling, use a slow speed and be gentle. You could also remove the chuck from the drill and hand drill the hole. The plastic is soft.
The Mtr1 resistor value in the S-Meter circuit on the PCB will need to be changed. This meter is a 200uA meter. The values for this will also be in the instructions and on the S-Meter page in the Circuit Details page.
For a 200 uA meter, the value for Mtr1 is 22K, and the value for Mtr2 is 100 ohms.
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