Technical tachometer calibration

[F4usT]

i will need some help... since i removed needles from cluster i have no idea what is 0 position of tachometer (revs counter)... because it's not on 0, it goes below 0 when you remove that tiny pin.

for speed i could read from GPS, fuel tank - fill to full and put needle, temperature from aftermarket temp gauge... but not sure how to calibrate revs gauge.

if somebody could look into dash, for example driving in gear 2, speed 50km/h and to check revs... few different measures could give best results. i could put gauge on 700revs on idle, but this is not correct especially now in cold times.

thanks a lot

 

[bollie69]

well.. not so smart to remove them in the first place.
can't help you, but wish you the best with it

 

[HP]

Get it nice and warm then blip it up to the rev limiter. Then you know where 7150 rpm is.

 

[bumble]

I can't help you Dav. My car is hibernating. You could use a timing strobe to accurately determine the crankshaft speed and adjust the rev counter to suit.

 

[F4usT]

found some digital laser tachometer for 10€ on eBay... i will try with this. (now waiting for a month to receive item)

• Display: Large 5 digit, 18mm LCD.
• Test select: Automatic.
• Range: 2.5 to 99,999 RPM
• Resolution: 0.1 RPM (from 2.5 to 999.9 RPM) 1 RPM (over 1,000 RPM)
• Accuracy: +/-( 0.05% +1 digit)
• Distance: 50 to 500mm/ 2 to 20 inch

http://www.ebay.co.uk/itm/Digital-Laser-Photo-Tachometer-Non-Contact-Tach-/390238842077?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item5adc0c2cdd#ht_5634wt_975