I got 1999 ford 150 it turns over but does not start here's the thing..the owner said it started but then died now not all the lights in dash come on when you turn on ignition could it be a sensor and

Try disconnecting and reconnecting wire harness plugs at the computer located in firewall on passengerpassenger side sensor won't affect the lights. Sounds like a loose or dirty connector plug

Have it read for codes, even if the check engine light is NOT on the computer will have stored information and codes. Discount auto stores will read codes for no fee. write them down.

The ignition switch appears to be operating the starter so it appears the problem is not there. Check to see if fire is getting to the plugs. An HEI spark detector (about 20 bucks) will verify spark to the plugs or not. If no spark to the plug, begin checking backward to the coil(s), then further backward if needed. The basics for the engine to run are air, spark, fuel. Checking for fuel requires to read the pressure from the rail.