What does it take to switch to 145mph speedo?
Thread Starter
Joined: Feb 2001
Posts: 13,758
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
What does it take to switch to 145mph speedo?
I have a 90 Rs with the 110 mph speedo and would like to convert to the 90-92 145 mph speedo. How would I callibrate the new speedo. I am pretty sure all of the other gauges are the same and will work without adjustment.
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Joined: Jan 2000
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Nope. The speedometers expect the same number of turns of the speedometer cable per mile or same of pulses from the VSS per mile, regardless of how high the scale goes.
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From: Somewhere around the South Side of Chicago just crusin' in one of the Niteriders
Car: 92RS 25th Anniv./88 IROC Z28 Vert
Engine: 305 TBI w/Tpi Air / 305 TPI
Transmission: 700r4/700r4
Axle/Gears: Posi
wHAT ABOUT THE SWITCH IN A '86 FROM THE 85 TO 145 SPEEDO? ANY ADJUSTMENTS OR JUST SWAP 'EM IN.
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Joined: Jun 2002
Posts: 687
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From: Tampa Bay, FL
Car: 85 IROC
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.42
stock speedo's are a direct plug in mechanical to mechanical or electronic to electronic, it gets tricky when you go from one to the other.
If your current speedo is working fine with the powerglide, then no you dont need to change cables...if it isnt working right, there could be several reasons.
If your current speedo is working fine with the powerglide, then no you dont need to change cables...if it isnt working right, there could be several reasons.
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