on the dash

The other definition is false. On the dash does refer to the dashboard of a car, specifically the gauge panel. The number refers to the highest speed on the speedometer.

The Boss - Rick Ross
I've got a Chevy with a 454 in the hood and it's got 125 on the dash.
(Most classic muscle cars displayed a top speed of 125 on the speedometer.)

T.I. - Big Things Poppin'
Think I won’t pull up in something with 200 on the dash.
(High-end supercars, particularly of Italian origin, commonly have the top speed of 200 on the speedometer.)

on the dash by suburban white boy June 27, 2008

on the dash

refers to the dashboard of a car; an associated number indicates the total amount paid for a vehicle including any modifications made (e.g. the price of the car, rims, stereo, engine upgrade, etc.)

think i wont pull up in somethin' with 200 on the dash....
i've got 125 on the dash...

both instances used so as to say, my car is worth, for example, $200,000 or $125,000 respectively

on the dash by b/real March 28, 2008

150 on the dash

Going 150 in ur whipski

Person 1: Yo go 150 on the dash for da vid fham
Person 2 Okok snm

*crashes going 150 in a 40 zone and totals car*

150 on the dash by Sexiest Mf Ever February 14, 2022

The on the volley dash 

When your partner is giving birth and you realise your not ready so you drop kick the baby back in and run off shouting panner!!

I had to to give her the on the volley dash lads I ain't ready yet

The on the volley dash by The big bad bat November 8, 2020