There is no point in changing it.
? The speedometer cable attaches to the transmission, not the engine. Please try again with more info.
Yes of why not...you should complete change your 12 valve 1300 cc engine to 16 valve 1300 cc EFI Engine for better performance and less fuel,GAS consumption.
Is it a 12 valve engine or 24 valve? What do you mean by speedometer sensor? Do you mean Vehicle speed sensor? If so why do you want to change that?
It should bury the speedometer depending on the gear ratio.
change the speed sensor and that should fix both of your problems
the speedometer switch is located at the rear of the diferential, remove wires clean and refit, that should cure it.
On your 1995 Ford Explorer you have a conventional speedometer cable driven speedometer , 1996 and newer Explorers have an electronic speedometer and a vehicle speed sensor according to my Haynes repair manual
If memory serves me correctly the speedometer is driven by a gear which is on the transmission, looking down from the top of the engine (below the airbox) should be a 2 wire sensor which is screwed into the transmission case.
The 1987 Chevy Celebrity uses an electronic speedometer, there is no speedometer cable. Assuming your speedometer has failed here are some possible causes: The VSS. vehicle speed sensor, may have failed. The speedometer may have failed. The ECM, engine control module aka computer, may have failed. There may be wiring issues such as unplugged, dirty connections, broken wires, etc.
Smaller tires should not cause the check engine light to come on. Smaller tires will cause the speedometer to be off.
Take it to Autozone and have it read the codes if it is OBD2 (1996 and newer) if not to see if the check engine light is related to the speedometer problem disconnect the negative battery cable and hold the brake down for about a minute. This should turn the check engine light off. If it does drive it to see if the speedometer works. If it does they are related somehow, if it still doesn't then it must be two separate problems.
There should be a cable that screws in the back of the speedo and into the transmission, the motor size has nothing to do with it.