180-200 is pretty high compression. Gauges can be off though, but it could indicate that you've got a timing or really loose valve lash. I wouldn't worry about it if that gauge reads everything high. I would worry about it if it's just high on that vehicle. That truck shouldn't go much above 175psi compression.

There are coolant temp sensors. One on near the valve cover (for the gauge) and one near the front of the plenum (for the ECU. They're easy to test and rarely fail. I'm a proponent of checking them at the ECU via the right pin because that helps prove that there isn't a short in the system. A short would register as "hot" to the ECU though - so it's unlikely.


Injector resistance of .001 is a problem. That means internal short and extremely high current draw. I take it you checked them with the harness plug disconnected and tested across the two terminals?

I've never heard of 4 injectors failing though..