You can generally tap off an injector to grab tach signal. It will be the "uncommon" wire on the injector (ie. each injector will share a common color on one of the wires, tap the opposite one).
They have here in Alberta. All blends including 91 and 93 have ethanol now. The only ones that I know of that definitely don't have ethanol are Co-op 91 and Chevron 94 (both clearly labeled as NO ETHANOL on the pumps).
When you say that the horn goes off, do you mean it pulses on and off like the alarm? Or does it just stay latched on? If it's the latter, then I would lean towards the horn switch in the steering wheel being bad. Especially since you are able to stop it by touching the wheel or horn.
That sounds like your temp sensor has packed it in. If it actually got to 260, it likely would have boiled over and pushed past the cap (ask me how I know........ :Cryin:). I would also check between the A/C condenser and rad just for good measure, as C5s are bottom feeders and can pick up all...
The vaccine was never intended to stop people from getting the virus. The vaccine is a tool used to prevent people from dying from the virus. No different than most other vaccines. I was vaccinated as a child against polio, measles, chicken pox, etc....... Did I get chicken pox? Yep! Did I...
Have you read the code to see what is triggering the light? That might point you in the right direction. You can read the code information directly from the DIC using the correct sequence. I believe it is posted here somewhere, or you can google how to read codes on a C5