View Full Version : RPM Gauge

01-09-2005, 06:57 PM
When the heater is switched on, the rpm gauge reads about 600 to 700 less. At idle, it only reads about 100 less (when heater is on), but around 3600 it quickly reads around 3000 when the heater is switched on. Ideas :confused:

01-10-2005, 01:10 AM
If it's one of the newer MC's with the electronic gauges, they are affected by poor grounding. Same thing was happening to my oil pressure gauge . When I turned on the heater the oil pressure would climb until it was pegged above 80 psi. Turn off the heater and the pressure would normalize in a short time.

Typically all the gauges and accessories are attached to a grounding strip, which is attached to the main grounding post. I moved the heater ground to the main grounding post under the dash and the problem went stopped.

The I noticed the same thing with my tower lights, fixed it the same way.

Hope this helps!

PS: This is the thread I started when I had my problem. It includes a letter I wrote to MasterCraft. They never replied!


01-10-2005, 11:38 AM
Thanks, I will try that today and see how it works. :)