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I have a Mallory Promaster 8354M distributor with a Mallory Promaster Coil in a '66 Mustang with a 351W. I've recently added a tachometer, but when I start the engine the tach needle moves to around 500 RPM and won't move any higher regardless of revs. The tach is installed correctly with the green signal wire connected to the -VE side of the coil. The supplier of the tach has suggested I need a tach adapter or signal filter to correct the feed to the tach. If I need a tach adapter, is the correct part 8910?
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If this doesn't help, contact MSD Tech Service (LINK):
https://www.holley.com/blog/post/tachometer_operation/ (MSD Ignition - Most Common Tach Adapter Options Chart)May God's grace bless you in the Lord Jesus Christ.
'92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/.623" lift/114° LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio Ford AOD, 10" 3000 RPM C6 billet converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.
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