Tach Problems. Please help.
Thread Starter
Staging Lane
Joined: Feb 2006
Posts: 87
Likes: 0
Tach Problems. Please help. So I recently installed a 5 inch tach in my car. Thought the install was pretty straight forward and rather easy. However, as I go to fire up the car I find two things wrong:
1. The tach response is half of what the RPMs actually are. That is say my stock is at 3k the tach is only at like 1.3K. I wired the tach speed wire with a splice to the #10 white wire in the PCM. Also, this mechanic I was talking to said that you should never connect this wire to the PCM as it may f-up your comp. I have no clue what he is talking about all the install guides I read as well as the older threads on here hooked it up there. Plus I don't know where else you would hook up the tach speed wire if not at the pcm. But, what are your thoughts? Obviosuly it is responding since it goes up some RPMS just not flawlessly. What could be causing this? Where did I go wrong with my wiring.
2. Okay, this one is kinda funny. For the lighting I hooked the tach up the dark green wire that controls the console lighting so that I could adjust the brightness on the tach. Well now the tach lights up only when I turn the console lighting all the way down, and vice versa. I really would like to have both lit at the same time, lol, so please offer your thought on WTF I did wrong and how the problem can be fixed.
Oh, please don't flame me or anything this was my very first attempt at doing any sory of wiring work on my car, and until I started it I thought I had done a pretty good job.
Thanks for the help as always your input is invaluable.
1. The tach response is half of what the RPMs actually are. That is say my stock is at 3k the tach is only at like 1.3K. I wired the tach speed wire with a splice to the #10 white wire in the PCM. Also, this mechanic I was talking to said that you should never connect this wire to the PCM as it may f-up your comp. I have no clue what he is talking about all the install guides I read as well as the older threads on here hooked it up there. Plus I don't know where else you would hook up the tach speed wire if not at the pcm. But, what are your thoughts? Obviosuly it is responding since it goes up some RPMS just not flawlessly. What could be causing this? Where did I go wrong with my wiring.
2. Okay, this one is kinda funny. For the lighting I hooked the tach up the dark green wire that controls the console lighting so that I could adjust the brightness on the tach. Well now the tach lights up only when I turn the console lighting all the way down, and vice versa. I really would like to have both lit at the same time, lol, so please offer your thought on WTF I did wrong and how the problem can be fixed.
Oh, please don't flame me or anything this was my very first attempt at doing any sory of wiring work on my car, and until I started it I thought I had done a pretty good job.
Thanks for the help as always your input is invaluable.
