You'd need the actual police computer chip to make it work.
It will, though technically it is illegal to istall on older motor into a newer car for emissions reasons.
check fuse
check the fuse
Fuse or relay defective.
On a 1999 Mercury Grand Marquis : The Original Equipment engine cooling thermostat would have been ( around 192 * Fahrenheit )
yes
Yes
It could be three thing... 1. You blown a fuse 2. You have a faulty switch 3. Your Marquis need to be rewired
If you are pulling it forward to make the light come on....try pushing outward...
tripometer doesn't work either.
You have to be more specific. What is not working?
Why not. Same engine, same car, and frame. Just compare the two to make sure.