I purched a 2000 mustang the previous owners lost the keys so I went an bought a new key new ignition installed it called out a locksmith to program new key to emu he said he couldn't program key because he couldn't get a signal from the anti theft light on dashboard doesn't come up an it had a aftermarket alarm system whice was recently uninstalled how do I get the anti theft signal to come on dashboard

 

That lock-smith is an idiot, there is no SIGNAL from the dashboard.
All it is, is a light that tells you the anti-theft is working. It should blink
when the car is off, and locked. IT may also blink even with the
key in, and on. IT has no signaling, nothing.

The induction coil for the key transponder is in the ignition cylinder.

The cluster might be where the PATS module is, but the light isn't a signal
device for the key.

Whom ever, or where ever, you bought it from, take it back.

 

So how can I get my key programmed just call out a lock Smith an have them program it as is

 

So should I just call a lock Smith out an have them program the key as is