Here is some additional information to make these LED's work best for the early cars.
The early cars have only one bulb for illumination in the Oil Press/Temp. gauge.
See picture below, it's the ome in the middle.
To show what need to be done, I removed the Temp. gauge.
There is a reflector shield for the standard bulb to reflect the light. That little shield need to be just bend down.
There is no need to remove and disassemble the gauge. Just remove the light bulb socket when changing to LED, and use a screwdriver and push the reflector down, before re-install the socket with the new LED.
Cheers
Engelbert