I went with the mechanical gauge, call me old school
Tapped the oil line that feeds the heads with a double banjo.
The location of the gauge in the lower fairing on the LeMans was an easy choice for me as the previous owner had a drilled a hole for a non existent switch.
Here are some pictures of the parts and such.
I do like to know that I have oil flow and what it is.
Hope that helps.
Kosta