VDO tach hookup help please.
One of the good guys here was kind enough to send me a used vdo tach. I think it's a VDO 333533 - it looks exactly like this one:http://shop.torresen.com/ships_store/index.php?p=details&mfc=VDO&sku=333533
There was a paper sticker on the bottom of the gage with hookup instructions, but it got wet and i can't make it out.
It's a potentiometer type, no dip switches. There are 4 blade terminals on the back.
From left to right:
+ (plus sign)
Letter "S" over a number "1"
downward arrow (ground)
Letter "S" next to downward arrow (ground)
There is also a socket in the back to stick a little light into, I know what to do with that. I assume that once I get the thing hooked up, I borrow a handheld tach from work and use the potentiometer to calibrate the thing. What I don't know is how to hook it up.
Help please - what hooks to what? I think I know what to do with the + (12 volt from the batt?) and the ground seems pretty straightforward, but what is S1? (one of the lugs on the gen? which one?) S ground? (huh?) I searched the archives and struck out.
Thanks in advance - chipping away.
(Oh yeah, installing is a 1958 Gm PD4104 with the 6-71 and the old generator the size of a Hyundai. You guys'll need to know that huh,,,)