760 V6 getting closer to scrapyard...help!

[russwinchester]

Hello all. So I bought my 760 a while back as it looked like an easy project. First mistake!

This car has been fighting me at every turn, every bolt is stuck, I have no skin left on my knuckles, it has almost broken me. I'm interested if there are any pearls of wisdom before I give up.

So car has been off the road for 10 years. Was running when it was put away (apparently).

Initial diagnosis: Main fuel pump. Replaced. Still no fuel to engine.
Swapped out a spare fuel pump relay (as in the green one). No change.
Replaced Crank position sensor as a precaution at this stage. No change.
Swapped out the fuel pump relay with the fan relay (radio suppression). No change.
Found slave fuel pump inop. Now replaced. Fuel getting to engine! Hurrah! Fuel gauge now reads full all the time, but this is the least of my concerns.
Third issue: 5 out of 6 injectors gummed up. Now all refurbed. Fuel spraying!
Still no start.

Checked spark and there is one, albeit yellow at the plug and a bit weedy.
Bought a Power Stage Amp, swapped out and no difference.

Noted that when engine cranks, tacho does not move (noticed it move on one start attempt a while back, dead since). Understand this signal comes from the coil.

Did test the coil off the car and behaved OK I thought, but have just bought a new coil as it's a cheap swap but not sure if it will do anything.

Before I throw any more time and money at it, have I missed anything?

I am not an electrical expert by any means hence why I've swapped out parts, thought this would be a simpler fix.

Any support / encouragement / ideas would be more than welcome!