I was wondering if anyone knew if the turn signal and wiper switch assembly is interchangable from the 86 CRX with any other Civic or other Honda product.

All '84-'87 Civics and CRX's use an interchangable signal/wiper assembly. However, the SI models have a rear wiper switch located on the wiper lever that the other models do not have. If you're desperate for a lever assembly you can use an assembly from an '86-'89 Integra, though this will require modification (cutting) of your Civic/CRX lever assembly cover since the Integra levers exit the assembly at a slightly different angle. The body of the Integra unit is dimensionally the same as the Civic/CRX unit but parts are not interchangable between the two models, ie, you can't use an Integra wiper switch on a Civic signal assembly.

I have an extra SI assembly that I would be willing to part with if you need it.