RPM gauge is blank now most of the time? Also power delivery issue

Had a dakota digital installed 1250 miles ago to fix speedo issues and now RPM gauge is going. have all other functions, oil, reserve etc. Sometimes I also have a lag in power delivery, give it gas and then it does not go right away. I give it more gas then it goes. Had a new belt installed, does it need to be adjusted? Is it an O2 sensor? I will clean sensor at trans, but beyond that I'm stumped.

So two problems
1) no RPM - or only occasionally.
Searched and found RPM setting may need to be increased (sometimes 500 at idle) - how do I adjust EFI idle?
20 give it gas, more gas, RPM's rise, but power not delivered to tire
Clutch, belt, something else?

thanks for the help
 
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