I've been scouring the forums and although I've found lots of posts about non-functioning gages, my symptoms are a bit different than others I found, so I thought I'd go ahead and post. I'd asked some of the same questions about the oil gage in the thread referenced below, but I'm fairly convinced now the problem is electrical, and as the original point of that thread has now been acheived, I'm reposting here. Apologies if this is bad ettiquite.
Oil gage sits at zero during idle. Slowly creeps up to around 30 at highway speed, drops to zero again at idle. 'Check gages' illuminates, bell sounds.
1. The motor was just swapped, and these exact symptoms were not previously present. With the old motor, the oil gage would occasionally go low, and the alarm would sound, but only in the warmer months. I'd always thought the gage was correct, and that I had an oil pressure problem. After I spun a bearing (leading to motor replacement) I was wishing I'd of payed more attention to the gage. Now I'm not so sure that the gage didn't also have a problem all along. History of that expedition is here:
2. In the past, I'd had a problem with the entire instrument cluster going dead and then coming back on again. Battery connections cleaned and reassembled, no problem since.
3. The driver information portion of the cluster will occasionally flicker, or portions of it go blank (odometer, and/or segments of the vehicle graphic disappear). This happens only in cold weather, and always returns to normal after the interior has warmed up to about 70F.
Actions taken so far:
1. Replacement of oil pressure sending unit.
2. Oil pressure test with mechanical gage (checked good).
3. Inspection of ground buss on both driver and passenger side. Looks good, no sign of corrosion, connections tight.
I'm thinking the next step is to pull the cluster (as per techinfo) and check for any loose connections there. Before I do that, does anyone have any suggestions based on the above symptoms?