VN 1988 Cluster slow response??

[Sandst4rm]

Hey guys I have recently got my ute on the road and discovered my VP cluster had a dead spot at 70kmh, I have taken it out again for the 800th time at this point and changed the circuit board to my original 1992 VP one with no tacho.

I sanded down the green stuff off the unused gauge pins to copper so i could use the tacho and twin gauges.
All working no jumping up or smacking needed as ive had the whole voltage regulator board resoldered while i was watching.

However just in case I swapped the actual odo/speedo part for my VN 1988 one i had with blue circuit boards not green and the 1988 tacho.
(changed odo gear for my new one out the VP odo/speedo) Its reading accurately now with no dead spot but my main concern;

The speedo and tacho are lethargic! like seriously slow as hell to read the value, Im at 80kmh on GPS speedo while its still creeping up from 60, it does reach it but takes AGES, same with tacho seems like the revs move up faster than it can keep up with.

Nothing like my VP speedo and tacho those things are lightning fast.

Any idea why???

 

[MikeC]

For what it's worth-I've got a VN speedo (blue cluster PCB) in a level 3 VQ II (green PCB) cluster and it works as well as the original.

With the tacho- are you sure it's for a 6 cylinder and not a V8?

Be very careful if you lubricate the internal moving parts of both these instruments. I over lubricated the mechanism of a Smiths tachometer on another car a few years ago and had to replace it- couldn't stop it from reading high.

 

[Sandst4rm]

For what it's worth-I've got a VN speedo (blue cluster PCB) in a level 3 VQ II (green PCB) cluster and it works as well as the original.

With the tacho- are you sure it's for a 6 cylinder and not a V8?

Be very careful if you lubricate the internal moving parts of both these instruments. I over lubricated the mechanism of a Smiths tachometer on another car a few years ago and had to replace it- couldn't stop it from reading high.

I mighta misled a bit idk, the main circuit board is green but the 2 little circuit boards on the speedo unit are blue

The tacho and speedo read accurate values once they have 'woken up' but what im sayin is like ill rev from 1000 to 2500 and itll be there for about 1.5 seconds before the tacho matches it. Same with speedo i can go up to 80 from 50 and ill be at 80 for about 2 seconds before the speedo matches it

The both do match up in the end though

 

[MikeC]

Sounds like the mechanisms might be sticking. I'd try cleaning the mechanisms (basically the pin spindles) with contact cleaner then lubricate them very sparing with silicone lubricant.