Question on aftermarket Tachs

[urbs4]

I am a long time visitor to this site, infrequent poster. I'd like to ask a question of those who have added an aftermarket tachometer to their cars because I often catch the phrase "I could not believe how off my stock gauges were" - while reading posts regarding installing aftermarket gauges. My question is - after adding the tach - what were you finding with regards to the stock tach - was it reading too low? too high? Thanks in advance.
Also - I found via the search - a ton of information regarding changing to white face gauges (which prompts my question above) - and I was able to do mine start to finish in about 3 hours. Thanks to all the posters here for sharing the (information) wealth.

Steve

 

[281pony]

i found that it was pretty close to the stock gauges down low. calibration gets worse in the higher rpm's.

i think most people find it really starts to fade off after 4k rpm's. i never rev my car high to watch, the rare ocassions i did i didnt compare

for awhile, i had a 5" fms tach and my 3 3/8" autometer tach both running. they were 200 rpm's off from each other. the autometer read 1800 at the fms 2k mark. they never got further/closer together that i could see though.

hope that helps some

 

[HISSIN50]

I dont rev it up much either Steve. At 2K rpm, my stocker reads 100 RPM higher than the AM tach.

You are right - what I have read also suggests the percentage of inaccuracy starts to show up way up in the Revs.