How do i change the speedometer on 1998 Avalon from kilometers to miles per hour ?

360 km/hr is NOT 40 miles/hr.
1 mile is about 1.6 km
To go from km to miles, multiply by 0.62
To go from miles to km, multiply by 1.6

Kilometers per hour to Miles per hour

On a digital display the default in U.S. is miles. Refer to your owner's manual or call dealer if you need to change it. A km is .6 of a mile, so just drive about 10 blocks (around a mile). If the odometer registers around 1 unit more it's probably miles, if it says close to 2 then it's probably km.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

You will most likely have to have a dealer order a different inst. cluster that is set up for miles. This is not a warranty condition and you would have to pay to do this. Dealer will call order in with VIN number and KM and the cluster exchange company will calculate how many mile it equates to and preprogram cluster.

A kilometer is .621 miles. Then just x. Example driven 10 kilometers. .621 x 10= 6.21 miles

1.6 kilometers per 1mph if doing 50mph =80kilometers used to be able to buy sticker you could put on speedo.

If it's digital there's a button somewhere I'm sure. However if it's a printed read out, then the cluster has to be changed over...however it should also read both. This is a common issue for service men bringing vehicles back from Europe as did I in 1998. Hope this helps !

Changing tires to another size than what was originally sent on the vehicle can change the accuratcy of the speedometer. To fix this requires changing the gear where the speedometer enters the transmission. The gears you change are probably a dealer item and they could tell you which one you need.

Yeah you may need a whole new dashboard because the whole panel circuit for may be messed up.

Do you mean kilometers to miles ? 1 km = .621 miles
rule of thumb, 100km/hr = 60mph.
80km/hr = 50mph.

okay,for one,the odometer doesnt read in miles per hr,it reads miles driven, and two i have no idea if its possible to change the odometer to km traveled,if you're talking about the speedometer,its already there,get a european cluster :p