I wanted to get more info before posting
I measured original pulley - same diameter as current pulley
I swapped speedo to get mph, that's all. I just noted it, nothing electrical there
I'm fine with the glow light, after testing 5 relays I have, I understand that
Drive belt is tight, now.
I find it strange that the tach doesn't operate until alternator light goes out. A friend has an 85 jetta turbo diesel his tach operates immediately as another post says here
The tach is maybe 50-60% of actual
Idle shows less than 500
While running id say 1800 is actually 3,000 or so
I finally got it on the highway
Rotella 15w40, Mann filter, 15miles on oil change
Got it warmed up around town
81f ambient temp
Car was plenty hot
within 20seconds on highway the oil buzzer and light came on
Not sure if tach actually hit 2,000 which would trip dynamic oil system
I have a 2ft stainless steel flex line to fender well (from filter flange), 2 tees- electric sender to non operating electric gauge (works sporaticly, or occasionally), liquid filled 100psi mechanical gauge and oem white sender
I tested the body of the sender for ground, so the ground flows thru the stainless steel flex line
Lifted hood - mechanical gauge shows better than 10psi at idle, revved engine, hit 40psi around 3k or just over, 30psi was around 2k, according to my autometer gauge that world immediately at start up and smoothly as I'd expect
Using a light tester on positive
Engine at idle I verified the blue sender on head to be ok
The white one also checked out ok, at idle no ground at plug, revved engine till psi went somewhere near 30psi light came on
so the sensor works
Next test is to tap onto the yellow wire at the sensor, run into car, when light and buzzer goes off ground that wire to see if the light goes out
Is it possible that the dynamic oil pressure and tach operation are the same issue?
How do I know if "W" output is correct?
Jon