Here's the 1.6 Engine

And here is the 1.8

And here is an Auto, highlighted in the red square is the transmission dipstick.

Oil level check for Auto
Make sure your engines warm and you've been through all the gears.
The engine must be running while you check the level.
Also have a sniff, if it smells burnt or looks black get the tranny oil changed
ENGINE NUMBER LOCATION
On a Mk1 1.6 the engine number is here, the top picture is just to show the general area


On a Mk1 1.8 the engine number is in a similar position on the exhaust side
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Disclaimer
Any work you do to your car is entirely your own responsibility. If in doubt, you should check technical advice with an independent , qualified person who has seen your car. The MX-5 Owners Club, its officers and forum contributors accept no reponsibility for any damage caused to your person or property as a result of you following or not following the advice offered on this forum.