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Do you have access to a scanner or Scangauge to read what temp the computer is seeing?
I find that there is about a 10deg difference between the ECM and dash gauge.
The dash gauges are more like fancy idiot lights than real gauges.
Get yourself a battery tender and plug them in. Basically it is a maintenance trickle charger that keeps them charged when not in use.
Got one on our '49 International Cub which would have the 6V battery die frequently. It was the best $50 that's been spent on that tractor. Also have one on...
A smart investment would be the strap type clamps for the exhaust. They don't crimp the tube like the standard U-bolts and you can get the pipes apart if you ever need to.
I've had the horn happen to me twice. http://www.thetruckstop.us/forum/showthread.php?t=7227&highlight=horn
Replaced the horn relay while I was rebuilding the engine. Hasn't been cold enough yet to set it off. Hope the relay fixed it.
That stealership is full of ship.
I had my Snap-on dealer order me a set. They were OTC.
You can find them online also.
OTC GM Injection Pump Wrench Set #6087
OTC GM Injection Pump Timing Wrench #6083
OTC Injector Socket #5060
http://www.otctools.com/products/2006catalog/pg220-225HeavyDuty.pdf
Your set may or may not have a 1/8NPT if not it is an easy pickup at NAPA.
Be aware NPT are taper threads, so if you go too deep your hole will get too big. If you don't have the thermocouple on hand, pick up a pipe plug and periodically test while tapping.