Where is the crank angle sensor on a 1990 Mazda rx7?

It's on the top of the engine at the front . It looks like a distributor with no leads. Which is kinda what it is. It should have a black plastic/steel cover/plate which is about 6cm across and about 1.5mm wide. They sometimes have billet alloy or steel covers with rotor logos etched into them. There are two maybe three wires which come from it too. It's just to the right and under your alternator. Hope this helps