standard RPM
 

Having an only stock truck it came with no tach. I amm going to get an ISSPRO. It is intercooled, and I have the plug under dash by fuses.
My question is how many rpm's does this 91.5 dually go?
ISSPRO has tachs for 0-3k and 0-4k thanks

get an 0-4k for room to grow later on.

Dar

thanks dar. with no speed ups the 3K sounds like more accurate

If your just using the truck as a dd and towing I would get the 3k because its more accurate, It's what I have in my dually. Get the 4k if your going to use the truck for play.

Mine is a DD and a HEAVY tow rig, but i'm glad i got a 4k cause a can burry a 3k
really quick.

but if your not gona do any mods at all then a 3k is more accurate for shure.

Dar

in my opinion i would go for the 4k because most likely you are gonna get a 3200rpm spring cause its the best mod u will ever do lol ha ha my tach is a little over kill but i had a gasser motor before so i got a tach that goes to 10,000k ha ha but i never get above 3500 lol

I have a 4k tach in all 3 of my trucks. They all have the stock gov spring and I can still hit 3500 rpm's. Don't get a 3, you will outgrow it. Your talking a full sweep 270 degrees or so for only a 4 k tach. Its plenty easy to read. Its not like its a 10k tach with the numbers close together.