Thread: How reliable are the RXP tach's?
05-01-2007, 09:38 PM #1
How reliable are the RXP tach's?
Are the tach's on the RXP's as reliable as the speedo And has anyone added an after market tach?
05-01-2007, 09:47 PM #2
They are extremely accurate
05-01-2007, 11:46 PM #3
- Join Date
- Aug 2005
- Jerry's guest bedroom
I asked the same question and Jerry told me they were nut on. If not I would want an aftermarket tach first thing. I watch the rpm more than anything including gps.
05-02-2007, 12:28 PM #4
I have yet to use a gps, but I've seen 70 come up on the display. I just got a stage I installed with Riva Washers and extension rod, it was hitting around 69 on the display. I've heard that the display is very accurate until above 65mph.
05-02-2007, 12:32 PM #5
05-02-2007, 03:24 PM #6
IMO they're kind of hit or miss for the kind of modifications we're doing...The 20rpm increment tachs are better but the 50 rpm increments leave a lot to be desired...
I ran mine against a pet tach for compare purposes with different AAT shuttles and found that is was anywhere from 20-40 rpms off and never reading the same rpms...
This may not sound like a lot but if you're trying to dial a prop and off by 40rpms you may be giving up as much a .5mph...IMO
For the thousands we spend in upgrades the couple hundred for a good tach seems a wise investment if you're really about squeezing every last little ounce out of it...
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