Alright folk
i changed direction a bit about mechanical gauge…. I bought another oil pressure sender instead. This sender is a bit less resistance I think. 75ohms at 0 PSI. The fitting is NPT instead of BPST, hence another adapter. At cold start, oil gauge is very close to middle and when engine warms up, gauge points about middle. I guess due to the less resistance, that’s why the gauge display as such. But for sure having the gauge actually display something gives a bit a peace of mind.
another successful day is I finally pay attention to the AC vacuum. I didn’t adjust it correct. At idle, when AC is engaged, there’s a vacuum at the throttle body to increase RPM a bit to keep the engine healthy.
last couple of weeks, with you guys help, I’ve able to solve the flasher blown fuse, no heat at fuses box, voltage regulator look healthy.
the next challenge is the fan clutch keep engaged too frequent.