So wipers work but dont park ? Relay ? Stalk ? Also 16v rev counter doesn't work ? Speedo does work .
If the wipers don't park, it'll almost certainly be the 12v feed to the wipers:
There is a switched live to the wipers, that keep them going, in the event you switch them off mid wipe.
This will allow the wipers to move back to their home position.
If you've lost this, they'll just stop wherever you turn the stalk off.
As above check cables, if you can whilst at it wd40 the linkages and drive pins for wipers this helps reduce load /amp required to operate.
My rear wiper does what it wants, its on third relay..in my ownership. sometimes stops when stalk put in off position, sometimes continues until i turn live off... on the car.. sometimes runs as should.