The TA gets attached to the car via the bracket on the transmission tunnel at the front.
But how does the rear of the TA get attached in an Omega?
Basically it just hooks under the back rest. the clamp at the front does most of the securing.
Wiring is a piece of pish (as Jim might say) live feed and earth. Me thinks the power to the rear cigarette lighter might be the best place to find a live feed as it is a fused switched live
.
If buying s/h TA from Ebay or such like, they were also available for the Vectra, these have a different base, which may not fit quite so snugly. Also Vectra C/ Signum beige is alot more orange than the Omega.
Base plate is just over £200 new, the actual box bit nearer £500, so £100 ish second hand is pretty good value if you want one. Mounting kit is £25-£35 from VX. Be prepared to pay for postage though as they're heavy/bulky.
HTH, Al.