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It's most likely the sending unit. have your mech check that for you.
Every component of the car will possibly need disassembled and checked for water damage.
I had a 1983 and a 87 some parts were interchangeable
could be just the spark plugs, start with that its only a few dollars to fix
If all do not work - check fuse in power distribution block under hood
You will need to remove the fan and check for debris in it.
I've bee told that the 1991 model doesn't have a cable it works off the speed sensor.
There is no speedometer cable on a 1990 Chrysler New Yorker. The speedometer is electically driven by a speed sensor mounted on the transmission. often the contacts are just corroded and some electrical cleaner will fix it right up. Other times the sender will have to be replaced. They are available from major Auto Parts stores like NAPA, or from the dealer.
It doesn't have a speedometer cable. The system is all electronic..It doesn't have a speedometer cable. The system is all electronic..
On a 1989, the speedometer signal comes from the sensor in the housing where the passenger side axle shaft goes in the transmission.
Try insulating the fuel line with a NON-FLAMMABLE material as it passes by the engine up to the fuel pump. Especially protect the fuel line from the heat of the exaust manifold.
First off where is it? If it is in line then you can cut that section off and replace it with rubber fuel line of equal size.