Low Line to High Line
 

My latest car a 75 saloon has Low-Line unit with Harman Kardon sound system. Is it easy to upgrade to High-Line ?

You'd need to find the correct highline / hk loom, strip the interior, replace the wiring loom front to rear, source all the components, brackets etc.

Doable? Yes.

Easy? Not for the faint hearted.

Finding the right loom? Tricky but not impossible.

I've done it before, be easier now to find a car with it all already fitted :D

That’s what I suspected so I’ll leave it how it is. The car is totally original so would be a shame to spoil it

Could have helped you out there Les had you decided to go ahead with the upgrade,I have a Hi Line loom with the steering wheel control unit as a left over from my recent rewire(although the donor car was a V8 SE so not sure that it would suit a FWD car).Also available is a tow bar wiring loom(V8 also).

Thanks Paul but definitely going to leave it original as I use Google Maps on my smartphone for navigation

No worries Les, will pop it away, may be of use to somebody later.