And now back to the old topic with my gauges.
I have installed a new 5V CVR in my instrument panel
in the same way new sender for temp and oil pressure.
Dash connector was out and all wires checked.
fuel gauge works, i hope correct (have it not filled the tank total full but i have spend 25 l and the gauge goes to 3/4 )
oil pressure between 25-20psi , goes to 0psi when hot.
Probably no electical reason
I have still no temp gauge. Gauge is totally on COLD
When do the sender wire on ground the gauge goes to HOT.
After about 3 miles i did this measurement:
Engine not running
A1,A2,A3 = 5V (CVR works)
A1 (oil) = 3,73 V on the gauge to ground and on the sender wire to ground (wire is ok, but only 3,73V??)
A2 (Fuel) 2,4V (Tank is a litte more than half full)
S3 (temp) 3.33V at the gauge and the sender unit to ground (wire is ok)
(But only 3,33V? a few days ago i had 4,73V)
Resistance from the (new) sender to battery ground: 25,1 ohm
like the specification in the pic this might be right and the sender is still ok
but sometimes i cant measure any ohmic resistance!
Have tried a second multimeter too.
And i have different ohmic data on the gauge.
I am on the end of my tether