Normally on those gauges the "S" terminal means sender. I can't imagine why a voltmeter would have an "S" terminal on it. Any one I have ever seen usually has a blank space with no lug in that spot. They just hook up to ignition (swithched) and ground. maybe there is an extra terminal there because they use that assembly for more than one type of guage by just changing faces.
I would try disconnecting the wire from the "S" terminal and see what happens. If nothing changes you can try grounding the "S" teminal and see what happens, but I don't think that's the problem. If grounding the "S" terminal causes the guage to go to zero, I have a feeling your guage has the wrong movement in it (oil press or temp). It's a long shot but I have seen weird stuff like that before. Maybe it was built on Friday, who knows. I would call Hardin then and ask if that terminal is supposed to be there.
As far as the no start, I think you're gonna have to start at the distributor to check for power, and work your way back to the ignition switch. If the fuse was too big it could have fried a wire somewhere down the line in the circuit, maybe at a weak point or loose connection.
The other possibility (one you don't want to hear) if you have electronic ignition, you may have arced to the tach feed terminal somehow and cooked the module or something in the distributor.
Sucks this kind of crap always happens on the weekend.
Don't want to sound like a prick but in the future ALWAYS disconnect the battery when working on any electrical stuff. I've been working on car and marine electrical systems for 20+ years, and it seems every time I forget, or don't take the time to do that it always bites me in the ass.
Hope this helps
[ June 14, 2003, 10:53 AM: Message edited by: Taylor LP ]