I am working on a john deere 5210 currently that we use for spraying. I had to replace the gauge cluster on the tractor because the fuel gauge failed on it. After replacing we used it for a season and it seemed that the rpms off. So we got a non contact laser tachometer to test if it was off. I tested the the rpms with the non contact laser tachometer off the crankshaft pulley and the results showed that the tachometer is not reading correctly but everything else on the cluster is working correctly. My question is there a way to adjust to correct it or could it be a faulty cluster that I got? Also could it be something else wrong with the tractor.
The result I got from testing:
Gauge RPM: Actual RPM with non contact laser tachometer:
Idle(500) 640
1000 1250
1500 1870
1700 2120
The result I got from testing:
Gauge RPM: Actual RPM with non contact laser tachometer:
Idle(500) 640
1000 1250
1500 1870
1700 2120