1981 380slc couple parts to id, help?

[lfausty]

1. throttle switch? if bad will it cause high idle? , cutting and crimping it for now, ok? need one anyway so want to know if those wires are grounding it out causing high idle.

2. the icu 8 pin unit but at the harness has 7 wires, i am testing (2 and 8 on unit and theres no 8 (empty).

3. o2 sensor located on this 380slc -- no cat/no signs of wires ever there. not on either the engines banks either. underside a one pipe (newish)is there no cat. just put a rear muffler on new.