Tachometer help
 

1983 944 n/a
Been trying to figure out a cluster/tach issue
When I got the car I replaced cluster and center console gauges

Not sure if related to tach
Oil pressure gauge was not working initially
Replaced oil pressure sender and no change
Tried flipping wires on sender and ding I have oil pressure gauge now

Now cant figure out tach
Its backlight lights up opposite to the other cluster lights
Lit during day, off when headlights are on.
Never any needle movement
Other cluster lights are working right and dimmer works right
There doesn't seem to be just 2 wires that are reversed because it's a harness plug into tach?

Thanks

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