Tachometer reading off

[dmacke01]

I recently purchased a '93 1500 with the 4.3 and NV4500. The original cluster did not have a tachometer so I bought a cluster w/ tach from a '92. There seems to be only two issues with it.

1. The tachometer reading appears to be off. With the engine idling it reads about 200rpm. When driving 50 mph in 3rd gear it reads 1,600 (I've calculated it should be about 2,000rpm). Could this be just an issue with clocking the needle? Also, it seems like the reading might not be very consistent but I haven't spent enough time driving it to be sure.
2. The speedometer hangs way below zero. Once I get moving the speed seems accurate (I've verified it with a phone app). This makes me think there is some sort of stop that is broken allowing the needle to fall too far.

The attached photo is parked with engine idling. Any advice is greatly appreciated. Thanks.

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[BoxerPitMix]

I'm betting your cluster came from a V8 truck.
I know I've read through some threads about this before, but afraid I can't remember for sure if you can really do much about it.

This may be useful, I'm not sure if it's the same cluster/year though.
http://forum.454ss.com/cgi-bin/forum/YaBB.pl?num=1300951389

 

[dmacke01]

I'm betting your cluster came from a V8 truck.
I know I've read through some threads about this before, but afraid I can't remember for sure if you can really do much about it.

This may be useful, I'm not sure if it's the same cluster/year though.
http://forum.454ss.com/cgi-bin/forum/YaBB.pl?num=1300951389

Damn, a small part of me was worried about that. Thanks for the link. I'll give it a read.