Not Ranked
Well for those of you who are interested...here's what I found out:
I called SW tech support...and BTW, they are pretty helpful and patient.
He told me to take an ohmmeter and measure across the sending unit to see if it was bad...it's kinda like a fuel sending unit...this particular one should read 240ohms at 0psi...and 80ohms (I think that's what he said) at 80 psi. So...
I came home, got my handy multimeter and measured the resistance. Sure enough....it made 239.8 with nothing running through it. I got a shot of brilliance and fabbed a quick connect for my air compressor, turned it down to 80psi and hooked it up...sure enough... 80 ohms. So the sending unit (both of them now) are good.
I screwed the sending unit back in the block and hooked up the gauge...even without turning the key on, I checked the resistance again, and it read 80...hmmm....It should ready 80 at 80 psi....not when the engine is dead. I took the gauge out and hooked it by itself to the battery...this time the ohmmeter wouldn't read crap...which means that it was an open circuit.
The tech guy also told me that if I hooked the gauge up to the battery and grounded the sending unit post out...the gauge should sweep all the way up.....each time I did that, it would do something different...sometimes it would go to 100psi....sometimes it would go to 70 and stop....other times it would go down instead of up. So by this means of testing, I consider my gauge......(what would the Butcher call it...) a turd-sucker.
I'll order another one.
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