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That points towards an issue either with the cluster or the connection from the engine ECU.

The dash is the one major difference between the Catera and Omega, and without seeing behind the cluster there may be additional wiring/plugs for the extra displays/warnings.

I suspect that the alternator only feeds the charge light (and battery voltage gauge), whereas the rpm signal comes from the engine ECU information (crank and/or cam sensor).

If the pedal trick works*, any codes may highlight a discrepancy.

* It should as the car is DBW.

The speedometer issue is almost guaranteed to be unrelated.

But engine right on high rpm. Car starts to stall when accelerating. Maybe I should start with (crank and/or cam sensor)?
Previous owner said that they changed crank sensor from omega.

Fuel filter ok?

if it miss fires on acceleration that points to ignition voltage and coil packs

That points towards an issue either with the cluster or the connection from the engine ECU.

The dash is the one major difference between the Catera and Omega, and without seeing behind the cluster there may be additional wiring/plugs for the extra displays/warnings.

I suspect that the alternator only feeds the charge light (and battery voltage gauge), whereas the rpm signal comes from the engine ECU information (crank and/or cam sensor).

If the pedal trick works*, any codes may highlight a discrepancy.

* It should as the car is DBW.

The speedometer issue is almost guaranteed to be unrelated.

But engine right on high rpm. Car starts to stall when accelerating. Maybe I should start with (crank and/or cam sensor)?
Previous owner said that they changed crank sensor from omega.

Yes sir they sent me a photo of the crack, it is between the valve and headbolt .
so it is compression only.

People don't seem to have an issue drowning rats.

To me, the only thing the originals do better than refurbished ones is that the ball joints are rivetted on, not bolted.

The balljoints usually last nearly forever, and the rear bushes are dirt cheap and readily available.  Once you fit the other shite, you lose these benefits.

Obviously, if you only plan on keeping it another 18 months, it's a moot point. As if somebody has already put pattern ones on.

Every Omega I have ever owned has required ball joints, so not sure where you get that idea from.

Hoping to move house at some point this year and parking four cars just isn't going to be feasible. I also know that the Silver Omega just doesn't get used and is really an ornament. Plan is to pop it in for an MOT then take the 6 pot brakes off it and return to standard setup along with the standard wheels and steering wheel, grill etc.

Once I get around to sorting that out i'll advertise it on here first, not that I think anyone would want to pay what I want for it.

I've had this car 15 Years, can't believe it!

A mate in Norn Irn was recently asking me if I knew of a nice V6 Omega for sale. Must be silver because the RUC ones were Silver and him being a retired member, is a bit sentimental about them in silver.
If you could let me know when it comes up for sale, I will mention it to him.
Cheers. 

I think that was for sale on ebay recently. Wouldnt want an estate myself, but otherwise a lovely thing.

Bring them in on our boats and send them back on a plane😱. FFS🤬. You couldn’t make it up it’s bloody criminal. And we have veterans starving on the F@king streets.

Ive always loved the idea of the fun that could be had from a sleeper car.
Probably my ultimate one would have been the poverty spec prefacelift Omega, with Lotus Carlton running gear built by Omegatoy.
10 or more years ago I was told it had sat neglected on a driveway in Cambridge for several years, which set off dreams of buying it.
I heard not long after that the owner had sold the running gear when he got an offer he couldnt refuse.

I reckon Robsey's V8 "Omega 2.5 estate" was pretty much perfect. Before he gave the game away by poking a blower through the bonnet!

(The) Buzzcocks