Is there anyway that I could mine zencash and ethereum at the same time with the ethereum dual miner? I see you can do it with multiple other coins but I search around and test with no success to figuring this out. If there is anyone out there that can help that would be greatly appreciated! 
You can dual mine with them, however, you would be hard-pressed to find a reputable developer with a single dual-mining program for equihash+ethash, since I doubt it is a popular combination.
Dual mining may or may not be more profitable than picking one cryptocurrency to mine at a time. This typically decreases hashrates for mining on both algorithms, and whether or not the decrease results in decreased overall revenue varies based on the two selected (and fluctuations in the values of the two coins).
Dual mining with GPUs is an attempt to utilize unused resources. For example, if there are resources that equihash relies more heavily on that ethash makes little use of, then dual mining the two would help make full use of the hardware, at the cost of reducing the access of each miner to "shared" resources of the hardware that mining on each algorithm requires use of.
Do not confuse dual mining with merged mining.
I tried it 3 times: 1st time, last time and never again 