Hi

I would like clarification if equipment modifiers for certain skills stack.

For example if i have a utility mechadendrite + servo-skull does that give me +30 to tech use.

Cheers.

In the particular case you chose as an example, they probably don't stack, as both the utility mechadendrite and the utility servo skull act as a combi-tool, so you gain the +10 only once (same if you have one of them and an actual combi-tool). Actually, there's probably an error there, as the mechadendrite gives you only +10, the combi-tool +20 and the servo skull is only listed as counting as a combi-tool. Probably an oversight...

Generally speaking, equipment modifiers should stack, for example wearing a cameleoline cloak and carrying a stummer would net you a +40 bonus to stealth checks.

That definitely seems a reasonable interpretation.

I was thinking that the mechadendrite might be a typo, but not sure if it is maybe just considered a lesser form of combi-tool since it has some other functionality as well.

Considering it says it functions as a combi-tool, I'd assume typo. Generally, if you think it's a typo in an FFG book, it probably is.