in areal pinch I would consider using some copper wire that's rated at 90 amps via electrical code.
I actually have some heavy gauge copper, like the power lines going down the road, and I would pull out a strand and either single it or double it to meet the same volume of metal as the 90 amp fuse.
This is not the safest! It is far safer than bringing the wire across and leaving out a protective device at all!
I actually had an issue in an old Dodge truck I had and ended up twisting a single strand across the burnt out element. I never had any issues with it and tried another fuse as well; the truck wouldn't start without that circuit, otherwise, I would likely not have tried it in the first place.
That being said, fuses are generally rated at for maximum circuit potential (startup energy rating) and if the fuse has blown then there is likely another issue causing it.
Runonbeer is usually correct and I would follow his direction.
Any modification of the electrical circuit over current protection has risk, limiting that risk is important and never do it if you're in any way uncomfortable with the possibilities.
I always use a single strand wire that is comparable, maybe 5% more potential than the original conductor, when modifying a circuit for temporary or permanent use!
We must always remember that any and all modifications we do are done at our own risk!
Not that you don't know that already.
stealership is probably holding one right now though too.