Tach not working properly

[Mx5+e30]

New to the E30 had a question my tach isn't working properly, it goes up but it's almost how would I explain it behind? First gear I don't see it move till I'm doing about 15 mph and when my car tachs out tach is barely around 3300 rpm btw its a 87 325 base model with a redline of 4500 or so temp gauge seems a little low as well never actually gets to the middle but that could have something to do with the thermostat. Any help guys?

Thanks

[Gregs///M]

The sender for the speedo is electronic and plugs into the differential cover. I would remove the sender and make sure its clean.

If that does not solve your problem, try pulling your gauge cluster and inspect the SI board for leaking batteries or dead batteries. Bad SI boards can cause speedo and other gauge problems.

[Mx5+e30]

My speedo seams to to work just fine it's my rpm Gauge that's not working properly it sits at 0 till i rev pretty high then it starts moving but never gets past 3.5k it's seriously like 1-2k rpm's behind I'll pull out cluster and check bored

[camip]

Also while you have your cluster out look at the soder joints and see if any are cracked or damaged.