Engine Missing and loss of power.

I did search and couldn't find what I needed.

I have a 1993 xj 4.0 w/ about 140k and I just replaced the head, put a APN header, new water pump and hoses and after I got it back together It is now missing and a huge loss of power. I checked the vaccum hoses and electrical connections and I'm not seeing any I didnt reconnect. Also my guages aren't working. Any Ideas???

Ground strap from the head to the firewall?

Your loss of power is a direct result of the missing engine.

Check your Crank Position Sensor. -B