Aparently these are needed for my swap a Coolant Temp and Oil Pressure their are 4 sizes available from street and performance for both
12mm x 1/8, 12mm x 1/4, 12mm x 3/8 and 12mm x 1/2 sizes for the coolant and for Oil 16mm x 1/8, 16mm x 1/4, 16mm x 3/8, and 16mm x 1/2.

How does one figure out what size is needed.