Digital tach pegged at idle were to start

[piece]

The tach is pegged looking for help not sure if it's a ground issue or maybe something with the display.Thanks Jim

 

[ScottHeidinger]

Start here

Boost/Tach Recalibration Svc (REPAIR SERVICE ONLY)

Boost/Tach Recalibration SvcREPAIR SERVICE ONLYDO NOT CUT THE WIRES TO THE TACH BOOST OR THERE WILL BE AN UPCHARGE OF $30!!!!! 1. REMOVE YOUR TACH MODULE FROM YOUR DASH2. PUT IT IN A SECURE BOX3. PUT A COPY OF YOUR ORDER SLIP IN THE BOX4. SHIP IT TO US 5. WE SERVICE IT 6. WE SHIP IT B

www.casperselectronics.com

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[ScottHeidinger]

Link doesn’t work for some reason...


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[piece]

Nice thank you

 

[Drewster]

Check the 2 electrical quick connectors near back of alternator and below fuel regulator....
They look like they should go together but should be separated and just left hanging or stuck in wire loom.
One is for the fuel pump and the other for the Tach.
If they are together you may get a max RPM reading


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[Drewster]

Not sure if this is your problem but it’s a quick check to ensure these wires are separated.

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[GNVenom]

FYI: http://www.installationinstructions.com/FYI/tachboost.pdf

 

[NY Twin Turbo]

All those lights lit up across the board all the time look cool. The boost too!
Get some small Autometer gauges for accuracy and ignore them.

 

[piece]

Thank you to all.Jim