I'm not positive about the Valiant dash.......if I saw it, I could probably help.........any chance on a picture? Best pointer I can give sight unseen is to work from right to left, unless amp gauge wires come into play......then they should come off before proceeding with any other connections.(and always disconnect the battery first).
Dropping the steering column by removing the main bolts will allow it to be dropped down somewhat out of your way.......you should not have to remove any of the steel framing..again, a pic would be helpful.
This type of job takes patience, whatever the model......and if you're not privy to where the plugs go back on, they need to be marked with a sharpie for remembrance.......some will only go back on one way.....but some could really make a mess of your day if you get them incorrect.......if it's a single plug, MARK IT and draw a pattern for yourself on a piece of paper for reference.
