1991 Mazda MX-5 Miata
 

We have a 91 N4A-HL Hydraulic units
We Bought an N4A EL electronic units
a Miata forum might be able to answer the question
How do we convert a EL transmission to a HL transmission?
all appear to be the same, BUT the EL is controlled by a computer, while the HL is pneumatic controlled NO computer