Bouncing tachometer

[jworason]

Hey guys,

I have a 98 Response and the problem is the tach bounces from 0 to 6,000 rpm's constantly. None of the other guages have the problem. Anyone have any ideas?

[txwakejunkie]

Bad connection, bad wire, or something grounding it out maybe

[jgouveia3]

try an 8 gauge wire from the Bus Bar to the battery for a better ground.

[UWSkier]

I saw this same behavior when our MDC went bad due to improper speedo pickup winterization by our dealer. Hope that's not it...

[jworason]

try an 8 gauge wire from the Bus Bar to the battery for a better ground.

Thanks for the reply! Someone else told me the same thing. Where is the bus bar?

[wienrdog]

Should be under the dash on the starboard side. Should have a whole bunch of black wires attached. Also make sure all the wires currently there are secured well.

[jgouveia3]

on my '00 response is is actually on the starboard side itself, not under the dash. its right in front of the throttle control.

[jworason]

Hey everybody,

Thank you very much for the info. I found the bus bar. It was right under the dash adjacent to the steering wheel on the right. I attached the 8 gauge wire to the battery, unfortunately it did not fix the problem. I guess the next task is to remove the dash to get to the tach itself and check for a bad ground on the back of the gauge. Any other suggestions.

[apexeon]

I have a 97 Response with the same problem. Sometimes it works sometimes it dosen't. My perfect pass RPM is right on and I have checked the ground wires but still have the problem. I have just ignored it but I think the problem is in the gauge itself.

[mrothwell]

my '97 Echelon had this issue once. I pulled the tach and rotated the 4/6/8 cylinder switch several times. re-installed and it worked great. That tach has a tendency to corrode that connection. You may be able to do this with the tach in the cluster.

[jworason]

Thanks for all the responses! I have tried everything everyone has suggested. My latest was to pull the dash and check the connection at the gauge. Everything looked good. My tach doesn't have a 4/6/8 switch. The tach still bounces. Anyone know where I can buy a replacement tach for a 1998 Response LX/Fuel Injected 350/330 h.p.

[MO-BluBu]

My tach on my 2000 Sunsetter bounces too. I have put a dedicated ground to the buss bar, and have tried a spare tach. I have also made sure all my connections are clean. I still get the bounce. My boat has two batteries. One for the engine and gauges and a second for the stereo system. I am suspecting the device that keeps the batteries charged. I think it is spiking the power when it switches between batteries when charging.

I am just offering another place to look.

[jorason]

Wow, I was searching for a place to buy the MDC replacemnt for a 98 Response because after all these years I still have the same bouncing problem.  I am looking to sell my boat and feel the bouncing tach should be fixed before I sell it.  Any ideas on where to buy one for a 98 Response.