Another tach question

[kroberts]

Simply stated, If I use a six cylinder coding plug and a 325i tach, my rpm's should be pretty close after the swap, right?

kr

[BDSax]

good question, i just finished my swap and my RPMs seem way off. alot more than it says, but i dont have exhaust so maybe it just sounds louder?

[Mike B.]

Simply stated, If I use a six cylinder coding plug and a 325i tach, my rpm's should be pretty close after the swap, right?

kr

Yes.

[87-325ic]

what should we do when swapping into an e30 325E?

get an i cluster?

[Beej '86 325es]

what should we do when swapping into an e30 325E?

get an i cluster?

When I researched this a few months ago, that's the conclusion I came up with. I think the only time you would need to use a different coding plug is if you're changing to an M3 cluster. Someone correct me if I'm wrong.

[Jason89i]

m20"i" clusters - change nothing
m20 "e" clusters - change to "i" tach and "i" coding plug, or just replace cluster.
m42 clusters - change to "i" coding plug
m14 clusters - change to "i" coding plug and change tach faceplate, or buy "inline" signal modifier. search other threads as its discussed in depth.

cheers, jason

[devonjordan]

Going from M42 to M3 cluster what would I need?

[Rev Engineer]

If you're going to use an e30 m3 cluster, then you need to swap the tach section and faceplate from an "i" - being careful not to damage the red e30 m3 needle. Or, you can purchase my electronic rpm converter which converts the 6 cyl tach signal down a 4 cyl signal which lets you keep the e30 m3 tach.

http://www.r3vlimited.com/board/showthread.php?t=74675