Opps forgot to put the link to the fuses post above.
http://www.madabout-kitcars.com/foru...highlight=fuse
The other problems you will have to overcome (not sure how Marlin did it for there race cars), is the incompatability between the Rover dials and VW sensors. EG temp gauge and oil pressure sensor. This will all need to be documented.
But I would guess Marlin are now using the SEAT instrument pack. If this is the case, it would be far easier to completley go all for VW/SEAT donor, switch gear the lot. Then just wire one colour coded system based on the VW. Or all black wires with numbered tags on the ends for identification.
Might be of some use this link. Document I made up.
http://www.kitcar.good-hosting.co.uk.../ELECTRICS.doc
I'll send you the other documents by email.